What kind of maps do you have?

The PRMD Geographic Information System (PRMD/GIS) product price list includes base maps, land maps, resource maps, and aerial/ortho photo maps. These cover the entire county at several scales.

The digital data layers include both the graphical features (such as road lines) and the tabular data (items such as address range, etc). All of the data layers built by the county are copyrighted.

The following maps and data CD’s are available for purchase at PRMD.

Does PRMD have Geographic Information Systems (GIS) data available?

Yes - we offer several data layers on CD’s for sale in ESRI shapefile format. See the product price list.

There are also free downloadable shapefiles and aerials available on the GIS Portal at https://gis.sonoma-county.org/

Other data may be available from ISD GIS Central by calling the GIS Request Line at 707-565-3819 or via e-mail at gis@sonoma-county.org

Do you produce custom maps?

Not at this time, however our GIS Technicians can assist with locating your area of interest using your Assessor Parcel Number (APN) or a correct street address. This information can then be used to create a semi-custom map using the available PRMD data layers. See the product price list.

How do I locate my property on PRMD's maps?

PRMD GIS techs will assist you with this when you visit the department.

What is my parcel number?

The Assessor's Parcel Number is the number assigned to a parcel by the County Assessor for property tax assessment purposes. This number is located on your property tax bill as shown below. If you don't have a tax bill available, we can locate the property if you provide us with the street address and the owner's name. Please call (707) 565-1900 during planner phone hours and ask to speak with the planner phone.

Our maps come in 3 standard sizes:

8-1/2 x 11 inches (A size)
11 x 17 inches (B size)
33 x 43 inches (E size)

Not all maps are available in all sizes. See the product price list.

Scale is dependent on the resolution at which the data is best viewed. Unless instructed otherwise we will print at the sharpest clarity.

How can I get a copy of an Ordinance map that shows re-zoning information?

Copies of adopted ordinances which officially changed the zoning on a particular property are available from the Board of Supervisor's office.

How can I get a flood determination on my property?

The staff at the Storm Water cubicle at PRMD can make the flood determination.
You may also purchase a site-specific zoning map, which shows the F1 Floodway and F2 Floodplain.

What is the Groundwater Availability Zone for my property?

The staff at the Well and Septic cubicle at PRMD can make the Groundwater Availability determination.
You may also purchase a Groundwater Availability map. See the product price list.