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Affordable Housing Fire Protection Responsibility Areas MR Mineral Resource Sonoma County
Air Quality Control Board Flood Prone Urban Area Parcels SR Scenic Resource
Area Plans and Specific Plans Future Parks Photos - Color Aerial - 2008 Supervisor Districts
Biotic Resource G Geologic Hazard Planning Areas Urban Service Areas
City Limits Groundwater Availability Areas Planning Area Policies USGS Topographic Quads (DRG)
City Spheres of Influence Habitat Connectivity Corridors Redevelopment Plans VOH Valley Oak Habitat
City Urban Growth HD Historic District Restricted Structures (Bridges) Waiver Prohibition Areas
Community Separators Land Use by Area Riparian Corridors (USGS Streams) Water Quality Control Board
Existing Parks Land Use Policy Scenic Corridors Wet Weather Zones
F1 Floodway Local Area Development Guidelines Scenic Landscape Units Williamson Act Land Contracts
F2 Floodplain Marshes and Wetlands SD Scenic Design Zoning by Area  
       

Affordable Housing

Layer Description
The affordable housing (AH) combining district dataset represents land use regulations for properties identified as being appropriate for Very Low and Low Income housing projects of 16 - 24 units per acre in Urban Service Areas (USA) where public services are available, and to implement Policy HE-30 of the Housing Element of the Sonoma County General Plan 2020 as adopted on September 23, 2008 by Ordinance No. 5799, 2008.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 11, 2012  (includes Rezone Ordinances to date)
Supportive Material
Zoning Code Regulation Index - Article 59
Layer Download Availability
At this time, the source data is not available for download.
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
Zoning (Zoning Designations), General Plan (General Plan 2020 Land Use)
Layer Viewable at Scale
All Scales

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Air Quality Control Board Boundary

Layer Description
The air quality control board dataset represents the Northern Sonoma County Air Pollution Control District (a.k.a. NSCAPCD) and the Bay Area Air Quality Management District (a.k.a. BAAQMD).

The Northern Sonoma County Air Pollution Control District set forth Rule 110 which states: rules and regulations are set forth to achieve and maintain such levels of air quality as will protect human health and safety; prevent injury to plant and animal life; avoid damage to property; and preserve the comfort, convenience and enjoyment of the natural attractions of the California North Coast Air Basin.

The Bay Area Air Quality Management District is committed to achieving clean air to protect the public's health and the environment in the San Francisco Bay region. The Air District aims to: 1) attain and maintain air quality standards, 2) increase public awareness of positive air quality choices, and 3) develop and implement protocol and policies for environmental justice.

It is the intent of all air pollution control districts and air quality management districts in the California North Coast Air Basin to adopt and enforce rules and regulations which assure that reasonable provision is made to achieve and maintain state and federal ambient air quality standards for the area under their jurisdiction and to enforce all applicable provisions of State law.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
May 2011
Supportive Material
Northern Sonoma County Air Pollution Control District, Rule 100

Bay Area Air Quality Management District
Layer Download Availability
PRMD GIS Data
Layer Feature Report
View Feature Report
Layer Viewable in Map
Base (Air Quality Measure)
Layer Viewable at Scale
All Scales

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Area Plans and Specific Plans

Layer Description
The specific and area plan dataset represents local communities subject to the Sonoma County General Plan 2020 Land Use Element Policy LU-1a as adopted on September 23, 2008 by Resolution No. 08-0808. There are 16 local communities which are subject to the specific and area plan development policies. Each community is unique and therefore, has particular policies and goals which assist in governing development potential.

Airport Industrial Specific Plan
Bennett Valley Area Plan
Franz Valley Area Plan
Hessel Area Plan
Larkfield-Wikiup Area Plan
Lower River Area Plan
North Santa Rosa Specific Plan
North Sonoma Valley Area Plan
Penngrove Area Plan
Petaluma Dairy Belt Area Plan
Sonoma Mountain Area Plan
South Santa Rosa Area Plan
South Sonoma Valley Area I Area Plan
South Sonoma Valley Area II Area Plan
West Petaluma Area Plan
West Santa Rosa Area Plan
West Sebastopol Specific Plan
Windsor Specific Plan

Airport Industrial Specific Plan

The boundary polygon represents the Sonoma County Airport Industrial Area Specific Plan adopted by Resolution #84-2213 on October 30, 1984. The boundary polygon identifies the specific plan and a master environmental area to assess the future use of 770 acres involving the Airport Boulevard planning area in the vicinity of the Sonoma County Airport.

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Bennett Valley Area Plan

The boundary polygon represents the Bennett Valley Area Plan adopted by Resolution #63206A on February 27, 1979 and modified by Resolution #93-0337 on March 9, 1993. The goals of the Bennett Valley Area Plan was to retain and enhance the rural character, protection of agriculture as well as to reflect the environmental and economic constraints, suitability and sensitivity of the study area in determining the location and intensity of development. To note, the Bennett Valley Area Plan boundary overlaps with South Santa Rosa Specific Plan boundary.

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Franz Valley Area Plan

The boundary polygon represents the Franz Valley Area Plan adopted by Resolution #63602 on April 17, 1979 and modified by Resolution #93-0337 on March 9, 1993. The purpose, goals and policies of the Franz Valley Area Plan was the creation of a citizens committee to focus on discussions of issues and goals. The committee policies were used in the formulation of the land use and open space plans, which are the primary means of implementing the Franz Valley Area Plan. The 1993 revisions of the Franz Valley Area Plan did not include an exhaustive evaluation or reconsideration of the policies or designations contained in the plan. The scope of the revisions was limited to that necessary to achieve General Plan consistency.

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Hessel Area Plan

The boundary polygon represents the Hessel Area Plan adopted by Resolution #64310 on July 31, 1979. The goals and policies of the Hessel Area Plan was to accommodate a variety of rural lifestyles and to protect and maintain agriculture in the area.

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Larkfield-Wikiup Area Plan

The boundary polygon represents the Larkfield-Wikiup Area Plan adopted by Resolution #66552A on July 29, 1980 and modified by Resolution #93-0337 on March 9, 1993. The goals and policies of the Larkfield-Wikiup Area Plan was to assist in basic land use decisions guided by the County commitment to the community separation concept and to commercial and industrial location guidelines established in the Community/Industrial Study of 1979.

The Board of Supervisors determined that to the extent the Larkfield-Wikiup Specific Plan provided policy guidance beyond that provided by the General Plan update and that such a plan should be reviewed and revised to focus on such policies. The review resulted in this Specific Plan being re-adopted as an Area Plan. In keeping with the above intent, the 1993 revisions of the Larkfield-Wikiup Area Plan did not include an exhaustive evaluation or reconsideration of the policies or designations contained in the plan. The scope of the revisions was limited to that necessary to achieve General Plan consistency.

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Lower River Area Plan

The boundary polygon represents the Lower River Area Plan adopted by Resolution #74191 on May 3, 1983, Resolution # 9760 on September 1, 1983, Resolution # 9789 on October 20,1983, and Resolution #75478B and #75479 on October 31, 1983. The goals and policies of the Lower River Area Plan was intended to resolve differences between the adopted 1974 zoning and the goals, policies, and projections for the same area specified in the 1978 County General Plan. The Lower River Area Plan is organized to serve as an Environmental Impact Report.

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North Santa Rosa Specific Plan

The boundary polygon represents the North Santa Rosa Specific Plan adopted by Resolution #73512 in January 1983. The goals and policies of the North Santa Rosa Specific Plan was intended to resolve differences between the adopted 1974 zoning and the goals, policies, and projections for the same area specified in the 1978 County General Plan. The North Santa Rosa Specific Plan is organized to serve as an Environmental Impact Report.

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North Sonoma Valley Area Plan

The boundary polygon represents the North Sonoma Valley Area Plan adopted by Resolution #68557 on January 5, 1981. The goals and policies of the North Sonoma Valley Area Plan was intended to resolve differences between the adopted 1974 zoning and the goals, policies, and projections for the same area specified in the 1978 County General Plan. The North Sonoma Valley Area Plan draws extensively from the North Sonoma Valley Zoning Plan adopted in 1974. The present plan incorporates the major goals and objectives of the earlier plan, and therefore, will continue to minimize residential growth and maximize preservation of open space, recreation and agriculture in the Valley. The North Sonoma Valley Area Plan is organized to serve as an Environmental Impact Report.

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Penngrove Area Plan

The boundary polygon represents the Penngrove Area Plan adopted by Resolution #84-675 on April 10, 1984 and modified by Resolution #93-0337 on March 9, 1993. The Penngrove Area Plan was created to re-evaluate residential densities within the Penngrove sewer service area. The plan boundary was extended beyond the immediate community to include the surrounding area where no previous specific plan had been undertaken. The Penngrove Area Plan is organized to serve as an Environmental Impact Report.

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Petaluma Dairy Belt Area Plan

The boundary polygon represents the Petaluma Diary Belt Area Plan adopted by Resolution #85-2789 on December 17, 1985 and modified by Resolution #93-0337 on March 9, 1993. The goals and policies of the Petaluma Diary Belt Area Plan was intended to resolve differences between the adopted 1974 zoning and the goals, policies, and projections for the same area specified in the 1978 County General Plan. The Petaluma Dairy Belt Area Plan is organized to serve as an Environmental Impact Report.

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Sonoma Mountain Area Plan

The boundary polygon represents the Sonoma Mountain Area Plan adopted by Resolution #61105 on June 20, 1978 and modified by Resolution #93-0337 on March 9, 1993. The Sonoma Mountain Area Plan was created out of response to concerned citizens over major land divisions proposed within the area. The plan methodology focuses on analysis of existing land use patterns and commitments, and the analysis of the environmental opportunities and constraints within the area. The Sonoma Mountain Area Plan is organized to serve as an Environmental Impact Report.

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South Santa Rosa Area Plan

The boundary polygon represents the South Santa Rosa Area Plan adopted by Resolution #71691 on May 4, 1982 and modified by Resolution #93-0337 on March 9, 1993. The goals and policies of the South Santa Rosa Area Plan was intended to resolve differences between the adopted 1974 zoning and the goals, policies, and projections for the same area specified in the 1978 County General Plan. The South Santa Rosa Area Plan is organized to serve as an Environmental Impact Report. To note, the South Santa Rosa Area Plan boundary overlaps with Bennett Valley Area Plan boundary.

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South Sonoma Valley Area I Area Plan

The boundary polygon represents the South Sonoma Valley Area I Area Plan adopted by Resolution #51799-51801 on December 9, 1975. The boundary polygon represents the South Sonoma Valley Area II Area Plan adopted by Resolution #51553 on November 18, 1975 and revised in February 1978 in compliance with Resolution #51553. Due to the large scale of the study area, the South Valley was divided into four separate study areas. The South Sonoma Valley Area I Area Plan encompasses El Verano, Boyes Springs, Fetters Springs and Agua Caliente. Whereas, the South Sonoma Valley Area II Area Plan encompasses areas northeast, east and south of the City of Sonoma.

The plans consider the social, economic and environmental characteristics of the area and blends such complex variables as community sentiment, physical capabilities of the land (particularly those characteristics directly related to wells and septic systems), and urban/rural economics into a comprehensive plan capable of serving both present and future needs. The plan goals and policies centers on enhancing the rural lifestyle that now exists in the Valley, conserve productive agricultural land for agricultural use, preserve hillsides in their present natural or agricultural state and retain open space by developing a taxing policy which favors agriculture and other open lands. The adopted land use and zoning within the Area Plan is consistent with the County General Plan, and echoes the intent and concepts embodied in the City of Sonoma's General Plan.

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South Sonoma Valley Area II Area Plan

The boundary polygon represents the South Sonoma Valley Area I Area Plan adopted by Resolution #51799-51801 on December 9, 1975. The boundary polygon represents the South Sonoma Valley Area II Area Plan adopted by Resolution #51553 on November 18, 1975 and revised in February 1978 in compliance with Resolution #51553. Due to the large scale of the study area, the South Valley was divided into four separate study areas. The South Sonoma Valley Area I Area Plan encompasses El Verano, Boyes Springs, Fetters Springs and Agua Caliente. Whereas, the South Sonoma Valley Area II Area Plan encompasses areas northeast, east and south of the City of Sonoma.

The plans consider the social, economic and environmental characteristics of the area and blends such complex variables as community sentiment, physical capabilities of the land (particularly those characteristics directly related to wells and septic systems), and urban/rural economics into a comprehensive plan capable of serving both present and future needs. The plan goals and policies centers on enhancing the rural lifestyle that now exists in the Valley, conserve productive agricultural land for agricultural use, preserve hillsides in their present natural or agricultural state and retain open space by developing a taxing policy which favors agriculture and other open lands. The adopted land use and zoning within the Area Plan is consistent with the County General Plan, and echoes the intent and concepts embodied in the City of Sonoma's General Plan.

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West Petaluma Area Plan

The boundary polygon represents the West Petaluma Area Plan adopted by Resolution #70087 on August 11, 1981 and modified by Resolution #93-0337 on March 9, 1993. The goals and policies of the West Petaluma Area Plan was intended to resolve differences between the adopted 1974 zoning and the goals, policies, and projections for the same area specified in the 1978 County General Plan. The West Petaluma Area Plan is organized to serve as an Environmental Impact Report.

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West Santa Rosa Area Plan

The boundary polygon represents the West Santa Rosa Area Plan adopted by Resolution #72471 on August 10, 1982. The goals and policies of the West Santa Rosa Area Plan was intended to resolve differences between the adopted 1974 zoning and the goals, policies, and projections for the same area specified in the 1978 County General Plan. The West Santa Rosa Area Plan is organized to serve as an Environmental Impact Report.

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West Sebastopol Specific Plan

The boundary polygon represents the West Sebastopol Specific Plan adopted by Resolution #65071 on December 11, 1979. The goals and policies of the West Sebastopol Specific Plan was oriented toward services and community activities in and around Sebastopol.

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Windsor Specific Plan

The boundary polygon represents the Windsor Specific Plan adopted by Resolution #862076-862080 on September 30, 1986. The Windsor Specific Plan was intended to assist in the systematic implementation of the overall Sonoma County General Plan for the Windsor area. Therefore, the goals and policies of the plan is intended to organize and clarify development policy and provide guidance for future zoning and subdivision activity for lands encompassed by the plan's boundaries.

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Layer Provision
By law, specific and area plans have been adopted consistent with the requirements of the State Planning and Conservation Law, Title 7, Article 8, Section 65450 and are expected to implement the General Plan as an intermediate level of detail between the General Plan and individual site plans. The specific and area plans are essentially an elaboration of the General Plan, its goals, policies and directives. Therefore, since the focus of the Sonoma County General Plan covers policies of county-wide significance, specific and area plans are intended to provide clear guidelines for development, analysis, and citizen participation on a local basis.

To note, the specific and area plans may have been adopted utilizing other resources, such as subdivisions, zoning and riparian ordinances, various County departments, and/or State agencies.

Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 2012
Supportive Material
General Plan 2020 Index  (includes amendments since adoption)

Planning Documents
Layer Download Availability
PRMD GIS Data
Layer Feature Report
View Feature Report
Layer Viewable in Map
Zoning (Zoning Designations)
Layer Viewable at Scale
All Scales

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Biotic Resource

Layer Description
The biotic resource (BR) combining district dataset represents protected biotic resource communities including critical habitat areas (place that is natural for the life and growth of an organism) and riparian corridors (banks of a river or stream) for their habitat and environmental value and to implement the provisions of Sections 3.1 and 3.2 of the general plan open space element. (Ord. No. 4643, 1993.)
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 11, 2012  (includes Rezone Ordinances to date)
Supportive Material
Zoning Code Regulation Index - Article 66
Layer Download Availability
The layer is not available for download at this time.
Layer Feature Report
There is no layer feature PDF report available at this time.
Layer Viewable in Map
Zoning (Zoning Designations)
Layer Viewable at Scale
All Scales

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City Limits

Layer Description

The city limit dataset represents the nine cities, urban (incorporated) municipality boundaries within the County of Sonoma. This dataset takes into account ALL RECORDED ANNEXATIONS as of December 31, 2012.

As defined by LAFCO (June 2003):
Non-contiguous Annexations
A parcel(s) can be annexed into a City without being contiguous with the City's boundary. In order for a non-contiguous parcel(s) to be annexed, the parcel(s) must satisfy 2 requirements: 1) parcel(s) must be owned by the City which it will be annexed into, AND 2) parcel(s) will be utilized for municipal purposes (i.e. corporation yard, water well, etc.)

Process of converting Non-contiguous City Parcel(s):
Non-contiguous City parcel(s) automatically revert to unincorporated property (Sonoma County jurisdiction) on the basis of meeting either of the following conditions:
1) the City's municipal use of the parcel(s) ceases, OR
2) the City sells the parcel(s) - either to the County of Sonoma or to private ownership.

Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 31, 2012
Supportive Material
City of Cloverdale

City of Cotati

City of Healdsburg

City of Petaluma

City of Rohnert Park

City of Santa Rosa

City of Sebastopol

City of Sonoma

Town of Windsor

GIS Online Services - Map Gallery - Incorporated City Urban Boundaries Maps (by City Name)
Layer Download Availability
PRMD GIS Data
Layer Feature Report
View Feature Report
Layer Viewable in Map
Base, Zoning, General Plan (Base Layers)
Layer Viewable at Scale
All Scales

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City Spheres of Influence

Layer Description
The sphere of influence dataset represents the nine cities, urban (incorporated) municipality sphere of influence (SOI) boundaries within the County of Sonoma as determined by the Local Agency Formation Commission (LAFCO).
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
March 6, 2013
Supportive Material
Sonoma County Local Agency Formation Commission

GIS Online Services - Map Gallery - Incorporated City Urban Boundaries Maps by City Name
Layer Download Availability
PRMD GIS Data
Layer Feature Report
View Feature Report
Layer Viewable in Map
Base (Base Layers)
Layer Viewable at Scale
All Scales

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City Urban Growth

Layer Description
The urban growth dataset represents the nine cities, urban (incorporated) municipality urban growth boundaries (UGB) within the County of Sonoma.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 2012
Supportive Material
GIS Online Services - Map Gallery - Incorporated City Urban Boundaries Maps by City Name
Layer Download Availability
PRMD GIS Data
Layer Feature Report
View Feature Report
Layer Viewable in Map
Base (Base Layers)
Layer Viewable at Scale
All Scales

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Community Separators

Layer Description
The community separators dataset represents the Open Space and Resource Conservation Scenic Resources Element 2.1 of the Sonoma County General Plan 2020 as adopted on September 23, 2008 by Resolution No. 08-0808. The community separators element assists in identifying eight areas that preserve the visual identities of communities by maintaining open space areas between cities and communities. These areas need to remain open or retain a rural character in order to avoid corridor-style urbanization.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 2011
Supportive Material
General Plan 2020 Index  (includes amendments since adoption)
Layer Download Availability
PRMD GIS Data
Layer Feature Report
View Feature Report
Layer Viewable in Map
General Plan (General Plan 2020 Open Space)
Layer Viewable at Scale
All Scales

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Existing Parks

Layer Description
The existing parks dataset represents the Open Space and Resource Conservation Outdoor Recreation Element 9 of the Sonoma County General Plan 2020 as adopted on September 23, 2008 by Resolution No. 08-0808. The outdoor recreation element assist in identifying and preserving adequate parklands and trails primarily in locations that are convenient to urban areas and on public lands to meet the outdoor recreation needs of the population, while not affecting agricultural uses. Therefore, the EXISTING designated outdoor recreation areas to provide pleasure and enjoyment for County residents are represented in this dataset.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
April 2010
Supportive Material
General Plan 2020 Index  (includes amendments since adoption)
Layer Download Availability
PRMD GIS Data
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
General Plan (General Plan 2020 Open Space)
Layer Viewable at Scale
All Scales

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F1 Floodway

Layer Description
The floodway (F1) combining district dataset represents land use regulations for properties situated in floodways (a channel for an overflow of water caused by flooding) to safeguard against the effects of bank erosion, channel shifts, increased runoff or other threats to life and property and to implement the provisions of the general plan public safety element. The application of this district shall be based upon data from the Federal Emergency Management Agency. Additional more detailed engineering analysis of flooding, erosion or other conditions may be necessary so as to prevent property damage and safeguard the health, safety and general welfare of people. (Ord. No. 4643, 1993.) The dataset is used in administering the National Flood Insurance Program by the Federal Emergency Management Agency (FEMA) and represents FEMA's Digital Flood Insurance Rate Map adopted December 2, 2008 and adopted Base Flood Elevation (BFE) modifications effective October 16, 2012.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 11, 2012  (includes Rezone Ordinances to date)
Supportive Material

Zoning Code Regulation Index - Article 56

FEMA Map Service Center

FEMA Map Information eXchange (FMIX)

FEMA Online Letter of Map Change (LOMC) Application (Electronic Letter of Map Amendment (eLOMA) Fact Sheet)

Layer Download Availability
At this time, the source data is not available for download.
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
Zoning (Zoning Designations)
Layer Viewable at Scale
All Scales

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F2 Floodplain

Layer Description

The floodplain (F2) combining district dataset represents land use regulations for properties situated in floodplains (a plain bordering a river and subject to flooding) to safeguard against hazards and damage which may result from flood waters. This district shall be combined with other combining districts as provided in this chapter. (Ord. No. 4643, 1993.)

The dataset is used in administering the National Flood Insurance Program by the Federal Emergency Management Agency (FEMA) and represents FEMA's Digital Flood Insurance Rate Map adopted December 2, 2008 and adopted Base Flood Elevation (BFE) modifications effective October 16, 2012.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 11, 2012  (includes Rezone Ordinances to date)
Supportive Material

Zoning Code Regulation Index - Article 58

FEMA Map Service Center

FEMA Map Information eXchange (FMIX)

FEMA Online Letter of Map Change (LOMC) Application (Online LOMC Fact Sheet)

Layer Download Availability
At this time, the source data is not available for download.
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
Zoning (Zoning Designations)
Layer Viewable at Scale
All Scales

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Fire Protection Responsibility Areas

Layer Description
The fire protection responsibility areas (RA) dataset represents the legal fire protection obligation between the Federal (FRA), State (SRA) and Local (LRA) jurisdictions within Sonoma County.  The fire protection responsibility areas are created, maintained and governed by the California Department of Forestry (CDF) and Fire Protection (CAL FIRE).
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
July 1, 2012
Supportive Material
California Department of Forestry and Fire Protection
Layer Download Availability
PRMD GIS Data
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
Base (Base Layers)
Layer Viewable at Scale
All Scales

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Flood Prone Urban Area

Layer Description
The flood prone urban area dataset represents a geographical area known as the Permit and Resource Management Department (PRMD) Flood Prone Ordinance 4467.  Flood Prone Ordinance 4467 addresses concerns regarding the impact of grading on existing or future drainage patterns.  Therefore, the ordinance identifies development policies grading and drainage within this designated, sensitive area.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
April 2010
Supportive Material
Zoning Code Regulation - Article 26, Glossary (Section 11)

GIS Online Services - Map Gallery - Flood Prone Urban Area
Layer Download Availability
PRMD GIS Data
Layer Feature Report
At this time, a layer feature PDF report is not available
Layer Viewable in Map
Base (Engineering & Water Resources)
Layer Viewable at Scale
8,300 Feet & below (1:100,000)

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Future Parks

Layer Description

The future parks dataset represents the Open Space and Resource Conservation Outdoor Recreation Element 9 of the Sonoma County General Plan 2020 as adopted on September 23, 2008 by Resolution No. 08-0808.

The outdoor recreation element assist in identifying and preserving adequate parklands and trails primarily in locations that are convenient to urban areas and on public lands to meet the outdoor recreation needs of the population, while not affecting agricultural uses.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
April 2010
Supportive Material
General Plan 2020 Index  (includes amendments since adoption)
Layer Download Availability
PRMD GIS Data
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
General Plan (General Plan 2020 Open Space)
Layer Viewable at Scale
All Scales

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G Geologic Hazard

Layer Description
The geologic hazard area (G) combining district dataset represents land use regulations for properties situated in hazard areas to reduce unnecessary exposure of people and property to risks of damage or injury from earthquakes, landslides and other geologic hazards in the Alquist-Priolo Special Studies Zone and to implement the provisions of Section 2.3 of the general plan public safety element. (Ord. No. 4643, 1993.)  The dataset is used in conjunction with PRMD General Plan Safety Element, Geologic Combining District maps (also known as "Geologic (G) Zoning").
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 11, 2012  (includes Rezone Ordinances to date)
Supportive Material

Zoning Code Regulation Index - Article 70

Layer Download Availability
At this time, the source data is not available for download.
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
Zoning (Zoning Designations)
Layer Viewable at Scale
All Scales

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Groundwater Availability Areas

Layer Description
The groundwater availability areas dataset represents four zones that identify water yield, natural recharge and/or major/marginal groundwater basins within the County of Sonoma.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
June 2010
Supportive Material
GIS Online Services - Map Gallery - Groundwater Availability Areas
Layer Download Availability
PRMD GIS Data
Layer Feature Report
View Feature Report
Layer Viewable in Map
Base (Engineering & Water Resources)
Layer Viewable at Scale
All Scales

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Habitat Connectivity Corridors

Layer Description

The habitat connectivity corridors dataset represents the Open Space and Resource Conservation Biotic Resources Habitat Areas Element 3.1 of the Sonoma County General Plan 2020 as adopted on September 23, 2008 by Resolution No. 08-0808.

The habitat connectivity corridors is one of four types of biotic habitats which assist in identifying and preserving natural and diverse biotic resource habitat areas from adverse effects of human activities.  The maintaining and improving opportunities for habitat connectivity throughout the County is essential for protecting biodiversity and sustaining native plant and animal populations.

Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
April 2010
Supportive Material
General Plan 2020 Index  (includes amendments since adoption)
Layer Download Availability
PRMD GIS Data
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
General Plan (General Plan 2020 Open Space)
Layer Viewable at Scale
All Scales

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HD Historic District

Layer Description
The historic district (HD) combining district dataset represents protected structures, sites and areas that are remainders of past eras, events and persons important in local, state or national history, or which provide significant examples of architectural styles of the past, or which are unique and irreplaceable assets to the county and its communities. (Ord. No. 4643, 1993.)  To note, HD may apply to all or a portion of a parcel.

In conformance with the open space and public safety elements of the general plan, the county of Sonoma declares that HD, Article 68, of Zoning Regulations Chapter 26 constitute its open space zoning pursuant to Government Code Section 65910. Section 26-02-020 Composition of zoning ordinance, Ordinance Number 4643, 1993.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 11, 2012  (includes Rezone Ordinances to date)
Supportive Material

Zoning Code Regulation Index - Article 68

Layer Download Availability
At this time, the source data is not available for download.
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
Zoning (Zoning Designations)
Layer Viewable at Scale
All Scales

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Land Use by Area

Layer Description
The General Plan land use by area dataset represents the broader countywide distribution, location and extent of land development by land use categories (designation) and density as specified in the Sonoma County General Plan 2020 as adopted on September 23, 2008 by Resolution No. 08-0808.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
October 23, 2012  (includes Amendments to date)
Supportive Material
General Plan 2020 Index  (includes amendments since adoption)
Layer Download Availability
PRMD GIS Data
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
General Plan (General Plan 2020 Land Use)
Layer Viewable at Scale
All Scales

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Land Use Policy

Layer Description
The General Plan land use policy dataset represents Sonoma County General Plan 2020 and zoning land development policies that are applicable to (site) specific properties within Sonoma County.The intent of the plan is that policies, guidelines, and standards be clear and direct so that property owners and citizens may easily understand its provisions and how they apply to parcels of land as well as their cumulative impact on future environmental conditions and quality of life.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 11, 2012  (includes Rezone Ordinances to date)
Supportive Material
Policies by Planning Area
Layer Download Availability
PRMD GIS Data
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
Zoning (Zoning Designations)
Layer Viewable at Scale
All Scales

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Local Area Development Guidelines

Layer Description
The local area development guideline dataset represents the discreet geographical areas subject to specific development guidelines within Sonoma County. The geographical areas include Canon Manor West Subdivision, Glen Ellen, Highway 12, Highway 116 Scenic Corridor, Sebastopol Road Urban Vision Plan and the Taylor/Sonoma/Mayacamas areas.

The local area development guidelines and goals are as follows:

Canon Manor West Subdivision Development Guideline:
The boundary polygon represents the Canon Manor West Subdivision Development Guideline, 237+/- acres located southwest of the intersection of Petaluma Hill Road and East Cotati Avenue, adopted by Ordinance #5675 & #5676 on July 18, 2006.

The goal of the Canon Manor West Subdivision Development Guideline boundary is to implement water conservation measures as described in Ordinance #5676. To note, Ordinance #5675 outlines the approved rezoning of the subject area (refer to adopted documentation for further insight).

Glen Ellen Development and Design Guideline, Subarea I and II:
The boundary polygon represents the Glen Ellen Development and Design Guideline adopted by Ordinance #4297 on November 14, 1990. The Glen Ellen Development and Design Guidelines boundary surrounds those parcels within subareas I and II of the Glen Ellen Study Area. The following applications within the subareas shall be evaluated in accordance with the Glen Ellen Development and Design Guidelines: Subarea I (exterior building permits, discretionary permits, and projects subject to administrative design review), and Subarea II (discretionary permits).

The goal of the Glen Ellen Development and Design Guidelines is to direct development so that the character of Glen Ellen is enhanced and maintained. The guideline defines a local area, as a subunit of a planning area, which will provide a greater level of detail for specific uses or development in a local area. The Glen Ellen Development and Design Guidelines represent revised goals, objectives, policies and design guideline contained in previous versions of the Glen Ellen Town Plan (February 1988 and November 1988).

Highway 12 Development Guideline:
The boundary polygon represents the Highway 12 Development Guideline adopted by Ordinance #5120 on August 25, 1998. The Highway 12 Development Guideline is applicable to parcels having frontage on Highway 12 from its intersection at El Verano Avenue, north, to its intersection at Agua Caliente Road. The Highway 12 Development Guideline is in conjunction with the Sonoma Valley Redevelopment Project Area.

The goal of the Highway 12 Development Guideline is to provide criteria for private development to ensure the consistency of each individual project with the overall character of the Hwy 12 corridor.

Highway 116 Scenic Corridor Study Guideline:
The boundary polygon represents the 116 Scenic Highway Corridor Study Guideline adopted by the State of California's Department of Transportation (Caltrans) on September 20, 1988.

The goal of the 116 Scenic Highway Corridor Study is to protect and enhance the corridor. Therefore, the corridor limits are principally determined by topography (land forms) and/or large, dense stands of vegetation limiting views from the highway. If vegetation or man-made structures do not obstruct views from the highway, the farthest ridge lines are the limits of the corridor. Only those ridges visible from the corridor are included; consequently, areas behind ridges are not included. The width of the corridor varies greatly from as little as 100 feet to as much as 14,000 feet. Property within the corridor could be subject to higher levels of planning controls to preserve the scenic quality.

Penngrove Main Street Design Guidelines:
The boundary polygon represents the Penngrove Main Street Design Guidelines adopted by Ordinance #5920 on December 14, 2010.

The goal of the Penngrove Main Street Design Guidelines is to evaluate the merits of projects located in and around Main Street in Penngrove, between Old Redwood Highway and Adobe Road, and as specifically depicted by Figure E of Ordinance # 5920 article.

Building permits involved new construction, or the exterior modification of existing structures, are subject to review to ensure conformance with the Penngrove Main Street Design Guidelines. In addition, all projects requiring discretionary entitlements, such as Design Review approval, Zoning Permits, and Use Permits, must comply with the Penngrove Main Street Design Guidelines.

Russian River Corridor Design Guidelines:
The boundary polygon represents the Russian River Corridor Design Guidelines adopted by Ordinance #5921 on December 14, 2010.

The goal of the Russian River Corridor Design Guidelines is to evaluate the merits of projects located within the central corridor which runs through the Russian River Redevelopment Project Area, and as specifically depicted in Figure A of Ordinance #5921 article.

The Russian River Corridor Design Guidelines apply to commercial and multi-family residential projects. Single family projects are only subject to the Design Guidelines when involving four or more units.

Building permits involving new construction, or any exterior modification of existing structures, are subject to review to ensure conformance with the Russian River Corridor Design Guidelines, as are all projects which require discretionary entitlements such as Design Review, Zoning Permits, and Use Permits.

Sebastopol Road Urban Vision Plan:
The boundary polygon represents the Sebastopol Road Urban Vision Plan adopted by Resolution Number 07-0481 on October 31, 2007.

The Urban Vision Plan for Sebastopol Road Corridor affects that stretch of Sebastopol Road between Dutton Avenue to the east and Stony Point Road to the west, linking both sides of Sebastopol Road as well as the area north of Sebastopol Road, ending at the Highway 12 right-of-way. The corridor is within the community of Roseland in the southwest area of Santa Rosa, California. While portions of the subject area are within the boundaries of the City of Santa Rosa, the majority of the properties are located in the unincorporated area of Sonoma County.

The goal of the Sebastopol Road Urban Vision Plan is to create a consensus among the local community as to what future development of the corridor should look like and what types of uses should be located there. The goal includes land use concept and urban design criteria for the greater planning area, street scape enhancements, and envisioning the Roseland Village Shopping Center and the Dutton Plaza as an ideal location for a neighborhood center.

Taylor/Sonoma/Mayacamas Design Guidelines:
The boundary polygon represents the Taylor/Sonoma/Mayacamas Design Guidelines adopted by Ordinance #5935 on May 10, 2011. The adoption amends Section 26-90-050 of the Sonoma County code to replace the existing Taylor-Sonoma Mountain Development Guidelines due to following General Plan scenic landscape units.

The goal of the Taylor-Sonoma Mountain Development Guideline is to reduce the visual impacts of residential related development within the Scenic Landscape Units of Taylor, Sonoma, and Mayacamas areas as visible from public roads.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 2012
Supportive Material
Zoning Code Regulation Index - Article 90
Layer Download Availability
PRMD GIS Data
Layer Feature Report
View Feature Report
Layer Viewable in Map
Zoning (Zoning Designations)
Layer Viewable at Scale
All Scales

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Marshes and Wetlands

Layer Description
The marshes and wetlands dataset represents the Open Space and Resource Conservation Biotic Resources Habitat Areas Element 3.1 of the Sonoma County General Plan 2020 as adopted on September 23, 2008 by Resolution No. 08-0808.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
April 2010
Supportive Material
General Plan 2020 Index  (includes amendments since adoption)
Layer Download Availability
PRMD GIS Data
Layer Feature Report
View Feature Report
Layer Viewable in Map
General Plan (General Plan 2020 Open Space)
Layer Viewable at Scale
All Scales

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MR Mineral Resource

Layer Description
The mineral resource - mining (MR) combining district dataset represents the conservation and protection of land that is necessary for future mineral resource production. The MR district is intended to be applied only where consistent with the aggregate resources management plan and combined with base zoning within the general plan's land intensive agriculture, land extensive agriculture, diverse agriculture and resources and rural development land use categories. This zone allows mining with the issuance of a surface mining use permit and the approval of a reclamation plan, but restricts residential and other incompatible uses. Its uses supersede those allowed in the applicable base district. (Ord. No. 4643, 1993: Ord. No. 2862)
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 11, 2012  (includes Rezone Ordinances to date)
Supportive Material
Zoning Code Regulation Index - Article 72
Layer Download Availability
At this time, the source data is not available for download.
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
Zoning (Zoning Designations)
Layer Viewable at Scale
All Scales

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Parcels [ActiveMap - PRMD]

Layer Description
The parcel dataset represents ONLY unincorporated Sonoma County land and takes into account ALL RECORDED ANNEXATIONS as of December 31, 2012.

A distinction should be made with respect to this layer which includes GIS parcels and the official Assessor Parcels residing in the Assessor Map books at the Sonoma County Assessor Office. For official parcel records please contact the Sonoma County Assessor (707) 565-1888.

These parcels should NOT be represented as survey data, and the official record of survey takes precedence where there are discrepancies. It is the end user's responsibility to check the accuracy of the GIS data by comparing it with the published data from the Sonoma County Assessor - Recorder office.

The Sonoma County parcel base was originally compiled from Assessor Parcel maps at a scale of 1:6000. The individual Assessor Parcel maps were enlarged or reduced in size using an electrostatic process to produce the maps at the 1:6000 scale, the maps were then fit together by hand and transcribed on to mylar. The mylar base consisted of 1:6000 USGS base map information typically found on the 7.5 USGS quad series. This base information consisted of Topography, Roads, Section, and Rancho lines to name some. Using this information, the Assessor Parcel maps were fit to the individual 1:6000 scale maps. Each 1:6000 scale map represents 1/6 (quad sixths) of a 7.5 minute USGS Quadrangle series map.

In 1998 the State Board of Equalization provided the impetus to produce the Russian River Project for all of Planning Area 4. One aspect required for this project was a digital parcel base for Planning Area 4. This involved the conversion of the 1:6000 mylars with the transcribed parcels on them into a digital version of the parcels. The mylars where scanned and georeferenced using the base map information originally included with the 1:6000 mylar base. The maps were georeferenced to a digital version of the USGS 7.5 minute Quadrangle series available from the Teale Data Center. The original projection was California State Plane Zone 2 NAD 1927. County Staff then used AutoCAD software to heads up digitize each 1:6000 scale map in Planning Area 4.

The seamless base prior to late 2002 was suitable for 1:100000 scale while the control points (the corners for the 1:6000 scale maps) were suitable for 1:24000 scale.

Prior to rectification to the Merrick 2000 orthophotography, the parcel data were derived from 1:6000 scale maps (enlarged from USGS 7.5 minute quadrangle 1:24,000 series) and digitized in California State Plane, Zone II, NAD 27 coordinates (survey feet), but were converted to California State Plane, Zone II, NAD 83 coordinates (survey feet) as part of a rectification process now underway.

The parcels used to use the USGS 7.5 minute quadrangle (1:24,000) series for coordinate control, but no guarantee is made for their spatial accuracy. The data were re-projected to NAD 83 coordinates to overlay the orthophotography, but the parcel boundaries will not correspond precisely with features in the images.

The parcels were rectified to orthophotography flown in April - May 2000 using georeferencing tools available in ArcGIS 8.3. This project was completed in July 2005. In general, the parcels meet National Accuracy Standards for 1:24,000 scale maps, and likely exceed that accuracy in urban areas.

To note, areas that have been successfully updated as such have a reasonable expectation of accuracy of +/- 10.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
July 1, 2012
Supportive Material
The parcel base represented in ActiveMap is a separate parcel base maintained by PRMD. Due to the sensitive nature of land development datasets maintained by Sonoma County Permit and Resource Management Department [PRMD], only those parcels which have been reassigned a parcel number [APN] or have been reconfigured due to lot line adjustments, subdivision and/or merger/splits, are updated by PRMD GIS staff..
Layer Download Availability
PRMD GIS Data
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
Base, Zoning, General Plan (Base Layers)
Layer Viewable at Scale
2,500 Feet & below (1:30,000)

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Photos - Color Aerial - 2008

Layer Description
The dataset provides a seamless countywide high resolution, ortho-rectified color aerial photo.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
November 2008
Supportive Material
Digital Globe
Layer Download Availability

The County is prohibited from distributing the source data. Parties interested in obtaining the source data should contact Digital Globe for pricing and availability.

Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
Base, Zoning, General Plan (Photos)
Layer Viewable at Scale
6,250 Feet & below (1:75,000)

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Planning Area Policies

Layer Description

The General Plan Planning Area Policy dataset represents General Plan 2020 and zoning land development policies that are applicable to (site) specific properties within Sonoma County.

The intent of the plan is that policies, guidelines, and standards be clear and direct so that property owners and citizens may easily understand its provisions and how they apply to parcels of land as well as their cumulative impact on future environmental conditions and quality of life.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 11, 2012 & October 23, 2012  (includes Rezone Ordinances & General Plan Amendments to date)
Supportive Material
General Plan 2020 Index  (includes amendments since adoption)
Layer Download Availability
PRMD GIS Data
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
General Plan (General Plan 2020 Land Use)
Layer Viewable at Scale
All Scales

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Planning Areas

Layer Description

The planning area dataset represents the nine geographical sub regions of Sonoma County's General Plan. 

The General Plan consists of Land Use Elements which provides the distribution, location and extent of uses of land for housing, business, industry, open space, agriculture, natural resources, recreation and enjoyment of scenic beauty, education, public buildings and grounds, solid and liquid waste disposal facilities, and other uses. Each Land Use Element has four major sections one of which includes policies applicable for each of the 9 geographical planning areas/sub regions.  Therefore, the 9 planning areas/sub regions provide the basis for geographically discreet-specific application of land use policies.

The 9 planning areas are as follows:

Area 1 - Sonoma Coast/Gualala Basin
Area 2 - Cloverdale/N.E. County
Area 3 - Healdsburg and Environs
Area 4 - Russian River Area
Area 5 - Santa Rosa and Environs
Area 6 - Sebastopol and Environs
Area 7 - Rohnert Park-Cotati and Environs
Area 8 - Petaluma and Environs
Area 9 - Sonoma Valley
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 2012
Supportive Material
GIS Online Services - Map Gallery - Planning Areas & Supervisor Districts
Layer Download Availability
PRMD GIS Data
Layer Feature Report
View Feature Report
Layer Viewable in Map
Base, General Plan (Base Layers)
Layer Viewable at Scale
All Scales

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Redevelopment Plans

Layer Description
The redevelopment plan dataset represents the three designated project areas governed by redevelopment agencies within Sonoma County.  The designated project areas include the Russian River Redevelopment Plan Area (North and South), The Springs (Sonoma Valley) Redevelopment Plan Area, and the Roseland Redevelopment Plan Area.

Redevelopment agencies exercise governmental functions and powers under the provisions of the Community Redevelopment Law (CRL), Health and Safety Code Sections 33000 et seq. of the State Constitution. Enacted shortly after the end of World War II, refined over the decades and tested in the courts, the CRL has provided a means by which cities and counties can address deteriorating physical, economic and social conditions in urbanized areas at the local level. It has become a primary tool for rehabilitation of housing stock, revitalization of business environments, creation of jobs, and for gaining the participation and investment of the property owners, business owners and residents of designated project areas. Through redevelopment, a project area will receive focused attention and financial investment to reverse deterioration trends in areas where the private sector is less inclined to invest without government assistance.

A redevelopment agency must establish a designated project area before it can undertake any of the activities allowed under the CRL. Sonoma County established its Community Redevelopment Agency in 1984 and, later the same year, completed the process of designating its first two project areas; the Roseland and Sonoma Valley project areas. The County's newest project area on the lower Russian River was approved in July of 2000.

The redevelopment plans and goals are as follows:

Roseland Redevelopment Plan:
The boundary polygon represents the Roseland Redevelopment Plan adopted by Resolution # 84-2347 on November 27th, 1984. The primary objective of the Roseland Plan has been to improve the area's infrastructure, primarily Sebastopol Road. The Project's focus is now being turned to affordable housing and mixed-use development opportunities.

Russian River Redevelopment Plan:
The boundary polygon represents the Russian River Redevelopment Plan adopted by Resolution # 5249 on July 18th, 2000.

The Russian River Redevelopment Plan states twenty-three Specific Goals and Objectives that include: restoration and expansion of the Project Area as a desirable visitor and tourist destination; revitalization, as appropriate, of the Project Area's businesses and business districts; enhancement and protection of the physical environment and sensitive habitat areas; preservation and enhancement of architecturally and historically interesting buildings and neighborhoods; improvement of substandard housing conditions; improvement of streets to ensure safe motor vehicle, bicycle and pedestrian movements; upgrading and improvement of utility services to reduce power outages; assistance in the repair, expansion or development of sewer facilities; and assistance to public safety entities in the provision of capital facilities and equipment to serve the Project Area and environs.

The Springs (Sonoma Valley) Redevelopment Plan:
The boundary represents The Springs (Sonoma Valley) Redevelopment Plan adopted by Resolution # 84-3379 on November 27th, 1984.

The Springs (Sonoma Valley) Redevelopment Plan has three primary Goals:
1. Create for the Sonoma Highway commercial district an efficient, attractive and identifiable commercial neighborhood in which existing and new commercial establishments and professional offices can capture a share of the growing market demand for goods and services in the area.
2. Alleviate deterioration in residential neighborhoods in order to stabilize and enhance the quality of the Project Area neighborhoods.
3. Maximize the natural environmental potential of the Project Area in order to create an attractive and efficient community for all persons working and living in the area.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 2010
Supportive Material
Sonoma County Community Development Commission (CDC)
Layer Download Availability
PRMD GIS Data
Layer Feature Report

View Feature Report

Layer Viewable in Map
Zoning (Zoning Designations)
Layer Viewable at Scale
All Scales

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Restricted Structures (Bridges)

Layer Description
The restricted structures dataset represents the transportation load ratings [weight limits] for structures (local agency bridges) within the County of Sonoma. The map specifies the legal weight structures for the annual transportation permits issued by PRMD.

For further details on bridges/structures subject to summer time crossing-use only, please contact PRMD Engineering Division at (707) 565-2268.

Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
October 2012
Supportive Material
Caltrans Sufficiency Rating - Local Agency Bridges
Layer Download Availability
At this time, the source data is not available for download
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
Base (Engineering & Water Resources)
Layer Viewable at Scale
12,000 Feet & below (1:144,000)

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Riparian Corridors (USGS Streams)

Layer Description
The dataset identifies countywide United States Geological Survey (USGS) streams that flow throughout the entire year (perennial) and those that cease for a period of time (intermittent).
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
August 10, 2006
Supportive Material
United States Geological Survey
Layer Download Availability
Sonoma County Vector Data
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
Base & Zoning (Base Layers), General Plan (General Plan 2020 Open Space)
Layer Viewable at Scale
All Scales

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Scenic Corridors

Layer Description

The scenic corridors dataset represents the Open Space and Resource Conservation Scenic Resources Element 2.3 of the Sonoma County General Plan 2020 as adopted on September 23, 2008 by Resolution No. 08-0808. 

The scenic corridors element assist in identifying and preserving roadside landscapes that have a high visual quality as they contribute to the living environment of local residents and to the County's tourism economy.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
May 2011
Supportive Material
General Plan 2020 Index  (includes amendments since adoption)
Layer Download Availability
PRMD GIS Data
Layer Feature Report
View Feature Report
Layer Viewable in Map
General Plan (General Plan 2020 Open Space)
Layer Viewable at Scale
All Scales

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Scenic Landscape Units

Layer Description

The scenic landscape unit’s dataset represents the Open Space and Resource Conservation Scenic Resources Element 2.2 of the Sonoma County General Plan 2020 as adopted on September 23, 2008 by Resolution No. 08-0808.

As the County urbanizes, the scenic landscape unit element assists in identifying areas that require the maintenance of openness for visual relief from urban densities/development.  Currently, there are 15 major scenic landscape units designated within Sonoma County.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
May 2011
Supportive Material
General Plan 2020 Index  (includes amendments since adoption)
Layer Download Availability
PRMD GIS Data
Layer Feature Report
View Feature Report
Layer Viewable in Map
General Plan (General Plan 2020 Open Space)
Layer Viewable at Scale
All Scales

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SD Scenic Design

Layer Description

The scenic design (SD) combining district dataset represents the preservation of the scenic beauty of the county. The scenic beauty of the county is an economic asset whose preservation will contribute to the physical, social, cultural, recreational, aesthetic, economic and general welfare of the people by protecting the appearance of the county and encouraging its important tourist resource. It is further recognized that the county contains areas of unusual scenic beauty and that rapid urbanization has encroached upon and eliminated such scenic areas elsewhere, especially where there has been uncontrolled and unregulated placement of structures and roads. (Ord. No. 4643, 1993: Ord. No. 1928.)

Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 11, 2012  (includes Rezone Ordinances to date)
Supportive Material
Zoning Code Regulation Index - Article 62
Layer Download Availability
At this time, the source data is not available for download.
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
Zoning (Zoning Designations)
Layer Viewable at Scale
All Scales

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Sonoma County

Layer Description
The Sonoma County dataset represents the largest political/jurisdictional boundary of local government within the State of California, United States of America (USA).  Sonoma County took official formation in 1850 and did not take formation from a "parent county" (e.g. a subset political/jurisdictional of a larger geographical region within California).

Historical notes:

On February 18, 1850, California's first Governor, Peter Burnett, signed into law the creation of the state's 27 original counties which included Sonoma County. (Note: On September 9, 1850, California became the State of California with the original twenty-seven counties.)

Original county boundaries often followed geographic features such as mountain ridges. In the middle of the last half of the nineteenth century many of these boundaries were changed slightly so that they now run along township lines and section lines. Sonoma County is one of the original 27 counties. Most of Sonoma County has been in the county since 1850 yet the present territory has three histories: 1) territory was in Mendocino County from 1850 to 1855, when it was added to Sonoma County, 2) territory was in Mendocino County from 1850 to 1859 when it was added to Sonoma County, and 3) Sonoma County had administered Mendocino County from 1850 to 1859; territory which at one time was in Sonoma County is now in Mendocino, Napa, and Solano Counties.

Sonoma County was named after "Sonoma" which is a Chocuyen Indian name translated by some as "Valley of the Moon" and by others as "land or tribe of the Chief Nose."
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
April 2010
Supportive Material
Sonoma County Homepage
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PRMD GIS Data
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Base, Zoning, General Plan (Base Layers)
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SR Scenic Resource

Layer Description
The scenic resource (SR) combining district dataset represents the preservation of the visual character and scenic resources of lands in the county and to implement the provisions of Sections 2.1, 2.2 and 2.3 of the general plan open space element. (Ord. No. 4643, 1993.)
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 11, 2012  (includes Rezone Ordinances to date)
Supportive Material
Zoning Code Regulation Index - Article 64
Layer Download Availability
At this time, the source data is not available for download.
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
Zoning (Zoning Designations)
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Supervisorial Districts

Layer Description
The board of supervisor dataset represents the five geographical sub regions of Sonoma County's legislative body which governs the largest political/jurisdictional boundary of local government within the State of California.

The Board of Supervisors of the County of Sonoma is charged with the responsibility of establishing policy to guide the various functions of the County and, where necessary, to establish procedures by which functions are performed. The Board is composed of five supervisors elected from supervisorial districts for four year terms.

As the county legislative body, the responsibilities of the Board of Supervisors are diverse. A major task of the Board of Supervisors is to manage the public money which comes to the county from property tax, sales tax, fees, and federal and state income grants.

The Board of Supervisors is committed to providing the highest quality service to the public in a timely manner. To insure that the public is heard on issues of concern, the Board of Supervisors provides a forum for problem solving as it relates to government agencies and processes. To meet that goal, the Board also provides information and appropriate referrals to individuals who can resolve conflicts between individual citizens and the county departments.

The Sonoma County Board of Supervisors sits as the governing board of Sonoma County and of various special jurisdictions such as the Sonoma County Water Agency, the Northern Sonoma County Air Pollution Control District, the Agricultural Preservation and Open Space District, County Sanitation Districts, and the Community Development Commission.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
January 2013
Supportive Material
Sonoma County Board of Supervisor Homepage

GIS Online Services - Map Gallery - Planning Areas & Supervisor Districts
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PRMD GIS Data
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Urban Service Areas

Layer Description

The urban service area (USA) dataset represents the designated limit to the urban development of unincorporated communities per Sonoma County's General Plan as adopted on September 23, 2008 by Resolution No. 08-0808.

Currently, there are 21 unincorporated urban service communities within Sonoma County.  The communities are limited to urban development through urban services which is the full range of public services and infrastructures including sewer, water, police and fire protection, roads, transit, etc.

The 21 urban service areas are as follows:
Airport
Bodega Bay
Cloverdale
Cotati
Forestville
Geyserville
Graton
Guerneville
Healdsburg
Larkfield
Monte Rio
Occidental
Penngrove
Petaluma
Rohnert Park
Santa Rosa
Sea Ranch
Sebastopol
Sonoma
Sonoma Valley
Windsor

Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 2012
Supportive Material

General Plan 2020 Public Facilities and Services Element [1f through 1i]

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USGS Topographic Quads (DRG)

Layer Description
The USGS topography dataset represents a scanned image, digital raster graphic (DRG), of the U.S. Geological Survey (USGS) 7.5-minute quadrangle map.

The scanned image inside the map neatline has been georeferenced to the surface of the earth and fit to the Universal Transverse Mercator projection. The horizontal positional accuracy and datum of the DRG matches the accuracy and datum of the source map.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
Various Dates
Supportive Material
United States Geological Survey (DRG)
Layer Download Availability
At this time, the source data is not available for download.
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
Base, Zoning, General Plan (Photos)
Layer Viewable at Scale
6,250 Feet & below (1:75,000)

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VOH Valley Oak Habitat

Layer Description
The valley oak habitat (VOH) combining district dataset represents the protection and enhancement of valley oaks and valley oak woodlands and to implement the provisions of Section 5.1 of the general plan resource conservation element. (Ord. No. 4991 § 1(h), 1996.)

The Valley Oak Habitat areas encompasses those basins, flood plains, terraces, and alluvial fans that have Clear Lake-Reyes, Haire-Diablo, Huichica-Wright-Zamora, Pajaro, or Yolo-Cortina-Pleasanton soil associations, as identified by soils data from the United States Department of Agriculture Natural Conservation Service. Within these 5 soil types only those classes with slopes of 9% or less are included. Therefore, the dataset represented herein is a subset of applicable soil types for Sonoma County.

The soils types are as follows:

Clear Lake - Reyes (CcA, CcB, CeA, CeB, CfA, RmA)
Haire - Diablo (HaB, HbC, HcC, DbC)
Huichaca - Wright - Zamora (HtC, HuB, HvC, HwB, HtA, WhA, WmB, WoA, ZaA, ZaB)
Pajaro (PaA, PaB, PbB, PcA, PcB)
Yolo - Cortina - Pleasanton (YIA, YmB, YnA, YoB, YrB, YsA, YtA, CrA, CsA, PeA, PeC, PgB, PhB, PkC, PlC)

The Official Zoning Database (OZD) was adopted by the Sonoma County Board of Supervisors on June 12, 2007 and became official on July 12, 2007 (30 days from date of adoption). Therefore, the VOH dataset is the official zoning database layer of valley oak habitat areas.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 11, 2012  (includes Rezone Ordinances to date)
Supportive Material
Zoning Code Regulation Index - Article 67
Layer Download Availability
At this time, the source data is not available for download.
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
Zoning (Zoning Designations)
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Waiver Prohibition Areas

Layer Description

The waiver prohibition dataset represents legally established geographical areas that prohibits waiver of any onsite sewage disposal system (septic systems) standards and regulations.  The standards and regulations include local, state, and federal. Prohibition areas are created due to extreme site limitations that affect the ability to construct a code compliant septic system.  Site limitations include high ground water conditions, excessive slopes, and small lots where well and stream setbacks can not be met, and other site constraints that prevent a septic system from being installed in accordance to adopted standards and regulations.

Currently, there are 13 waiver prohibition areas within Sonoma County.

Camp Meeker is the boundary of the area affected by Resolution No. 98-0102, revising a prohibition against waivers to on-site sewage disposal regulation in the community of Camp Meeker.

Canon Manor is the boundary of the area affected by an Ordinance (unknown number) adopted on 4/5/88, to address the problem of contamination of the aquifer in the area of the Canon Manor subdivision.

Carmet is one of the boundaries of the area affected by Resolutions 70173, 70174, & 70175 and a Joint Agreement between the Sonoma County Department of Health Services and the North Coast Regional Water Quality Control Board dated May 25, 1979, relating to the coastal subdivisions of Carmet, Rancho del Paradiso, Salmon Creek, Sereno del Mar, and the community of Jenner.

Happy Acres is the boundary of the area affected by regulations per Sonoma County Code, Chapter 7 and the North Coast Regional Water Quality Control Board Basin Plan.

Jenner is one of the boundaries of the area affected by Resolutions 70173, 70174, & 70175 and a Joint Agreement between the Sonoma County Department of Health Services and the North Coast Regional Water Quality Control Board dated May 25, 1979, relating to the coastal subdivisions of Carmet, Rancho del Paradiso, Salmon Creek, Sereno del Mar, and the community of Jenner.

Monte Rio Wastewater Pollution Control Area is the boundary of the area affected by Resolution No. 97-0516 adopted on April 22, 1997 prohibiting waivers to on-site sewage disposal regulations in the Monte Rio Area.

Penngrove south cotati is the boundary of the area affected by Resolution 63649, dated April 24, 1979, designating a waiver prohibition area of wet-weather percolation test requirements within the area rezoned by the Penngrove/South cotati rezoning study.

Petaluma Nitrate is the boundary of the area affected by Ordinance No. 2607, an urgency ordinance to address the problem of contamination of the West Petaluma aquifer with nitrate.

Rancho del Paradiso is one of the boundaries of the area affected by Resolutions 70173, 70174, & 70175 and a Joint Agreement between the Sonoma County Department of Health Services and the North Coast Regional Water Quality Control Board dated May 25, 1979, relating to the coastal subdivisions of Carmet, Rancho del Paradiso, Salmon Creek, Sereno del Mar, and the community of Jenner.

Russian river meadows (aka Rien's Beach) is the boundary of the area affected by Sonoma County Code Sections 7-12 (I) et seq, and the North Coast Regional Water Quality Control Basin Plan as currently revised, which precludes the creation of a health hazard due to the surfacing of sewage effluent from individual sewage disposal systems and contamination of the ground and surface waters of the State.

Salmon Creek is one of the boundaries of the area affected by Resolutions 70173, 70174, & 70175 and a Joint Agreement between the Sonoma County Department of Health Services and the North Coast Regional Water Quality Control Board dated May 25, 1979, relating to the coastal subdivisions of Carmet, Rancho del Paradiso, Salmon Creek, Sereno del Mar, and the community of Jenner.

Serena del Mar is one of the boundaries of the area affected by Resolutions 70173, 70174, & 70175 and a Joint Agreement between the Sonoma County Department of Health Services and the North Coast Regional Water Quality Control Board dated May 25, 1979, relating to the coastal subdivisions of Carmet, Rancho del Paradiso, Salmon Creek, Sereno del Mar, and the community of Jenner.

South wright is the boundary of the area affected by Sonoma County Code, Chapter 25B, and Sonoma County Code, Chapter 7 (findings established 1982-83), which establishes minimum measures to protect the health of the public and the groundwater aquifer within the area.

Thomas larkin woods, unit 1 is the boundary of the area affected by a Joint Innovative System Agreement, and the North Coast Regional Water Quality Control Board Basin Plan, which is intended to preclude a hazard to the community water system in Unit 1 of Thoma Larkin Woods Subdivision.

Westvue meadows is the boundary of the area affected by direction from the North Coast Regional Water Quality Control Board, dated January 4, 1978, the North Coast Basin Plan, Sonoma County Code Chapter 7, and the Uniform Plumbing Code to insure adequate protection of the ground water aquifer.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
April 2010
Supportive Material
There is no additional supportive material at this time.
Layer Download Availability
PRMD GIS Data
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Base (Engineering & Water Resources)
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Water Quality Control Board

Layer Description

The water quality control board dataset represents two regional board jurisdictions within the County of Sonoma.  One in the north called the North Coast Regional Water Quality Control Board based in Santa Rosa, and one in the south called the San Francisco Bay Regional Water Quality Control Board based out of Oakland.  The Water Quality Control Board is one of the nine statewide regional boards tasked to enforce the California Porter Cologne Water Quality Control Act.

Each regional board has delegated its authority to regulate onsite waste water disposal systems to Sonoma County PRMD Well and Septic Division.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
April 2010
Supportive Material
California State Water Resources Control Board

CalWater
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Wet Weather Zones

Layer Description

The wet weather zones dataset represents seven zones within Sonoma County.  Wet weather zones are geographical areas where rainfall data is collected and tracked for purposes of determining when wet weather percolation testing and ground water observations and can be conducted.  Each wet weather zone is unique in its accumulation of rainfall.  Depending on your location in the county rainfall will vary.  As an example you will see much more rainfall in the Cazadero area then you would see on the Santa Rosa plain due to many factors including microclimate variables, elevation, orientation and slope of terrain, and rain shadow influences.  Each zone has a historical rainfall measured in inches that PRMD tracks and uses for the opening of wet weather testing periods for percolation testing and ground water elevation observations.

The seven wet weather zones include Cloverdale, Guerneville, Healdsburg, Petaluma, Santa Rosa, Sebastopol and Sonoma.

The "Memorandum of Understanding" with the State of California Regional Water Quality Control Board allows for wet weather percolation groundwater testing between January 1 and March 1, and after having received 50% of the average rainfall for the geographic area.

A property which is located within 2,500 feet of a dividing line between groundwater determination zones is considered to be in either of the zones. This determination can be made by PRMD Well & Septic staff.

The seven Wet Weather Zones and total rainfall amounts required for testing are as follows:

Cloverdale, 20"
Guerneville, 25"
Healdsburg, 20"
Petaluma, 12.5"
Santa Rosa, 15"
Sebastopol, 17.5"
Sonoma, 15"
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
May 2011
Supportive Material
GIS Online Services - Map Gallery - Wet Weather Zones (Percolation Test / Groundwater Determination Zones)
Layer Download Availability
PRMD GIS Data
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Base (Engineering & Water Resources)
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Williamson Act Land Contracts

Layer Description
The Williamson Act dataset represents parcels within the County with a Type I (a.k.a. \"Prime\"), Type II (a.k.a. \"Sub-Prime\") or Open Space Type II Williamson Act (WA) contracts in effect January 1, 2013.  The dataset assists in identifying and analyzing parcels under WA contract so as to avoid issuance of permits for non-agricultural development that may violate the terms and/or conditions of The California Land Conservation Act of 1965.

The California Land Conservation Act of 1965--commonly referred to as the Williamson Act--enables local governments to enter into contracts with private landowners for the purpose of restricting specific parcels of land to agricultural or related open space use. In return, landowners receive property tax assessments which are much lower than normal because they are based upon farming and open space uses as opposed to full market value. Local governments receive an annual subvention of forgone property tax revenues from the state via the Open Space Subvention Act of 1971.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
January 2013
Supportive Material
State of California Department of Conservation

GIS Online Services - Map Gallery - Williamson Act Land Contracts
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PRMD GIS Data
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Base (Planning)
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8,300 Feet & below (1:100,000)

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Zoning by Area

Layer Description
The zoning by area dataset represents the detailed countywide distribution, location and extent of land development by base zoning districts, density and parcel specific combining districts (CC, TS, Z) as specified in Sonoma County Code Zoning Regulations Chapter 26.

The following are explanations of zoning density:

In urban areas, the density is in "number of dwelling units per acre." For example, "R2 B6 10 DU/AC" means the density is 10 units per acre.

In rural areas, the density is in "number of acres per unit." For example, "RRD 60" means the density is 60 acres per unit.

For properties that have a MINIMUM lot size, it is indicated by a second number following the density. For example, "AR B6 10/3" means the density is 10 acres per unit and the minimum lot size is 3 acres. In addition, an example of "RRD CC B6 160/240" means the density is 160 acres per unit and the minimum lot size is 240 acres.
Layer Provision
Since the GIS data was developed for planning purposes and use in publication of maps and/or database creation, the data is for illustrative purpose only and is not suitable for parcel specific decision making. Therefore, the GIS data presented herein are approximations and further land development determination is at the discretion of the PRMD planning staff which may require a parcel specific site review (to draw parcel specific conclusions).
Last Update
December 11, 2012  (includes Rezone Ordinances to date)
Supportive Material
Zoning Code Regulation Index
Layer Download Availability
PRMD GIS Data
Layer Feature Report
At this time, a layer feature PDF report is not available.
Layer Viewable in Map
Zoning (Zoning Designations)
Layer Viewable at Scale
All Scales

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