WUI - Wildland Urban Interface

Marin WUI Wildland Urban InterfaceWildland Urban Interface, or "WUI" is NOT a designation of potential wildfire severity - it's a somewhat loosely defined description of an area where urban development meets undeveloped lands at risk of wildfires.  The federal definition of WUI excludes areas where development falls below a certain threshold, so a single house, far from others may not be considered to be in the "WUI" even though it's in the middle of a wild area.  Conversely, areas with dense development may not be considered WUI because of the housing density, even though they may be close to wildlands.

In Marin, the WUI maps were first developed by County government in the late 1990s, based on the federal definition. These boundaries have changed somewhat over time, and the maps may - or may not - have been updated to capture new development.  There are also political considerations - elected bodies like city councils "adopt" WUI maps for their jurisdictions, and in some cases have altered the maps to take into account local conditions, especially where WUI boundaries might trigger building or vegetation management requirements. 

Understanding this map:

  • FIRESafe MARIN did not draw the maps.
  • The WUI map is NOT a map of fire risk or hazard.
  • WUI boundaries can change as development patterns and density changes.
  • There is no universally accepted definition of WUI, and it can fluctuate or be defined differently in geograhic areas with different wildfire risk and hazard profiles.
  • The maps may take into account political or local considerations.
  • The WUI map shown at FIRESafe AMRIN uses the boundary published at MarinMap.org by the County of Marin.  It is not necessarily the most up-to-date or "official" map, and may not reflect the specific boundary adopted in all jurisdictions.

How to Determine if Your Home is in the WUI

Zoom in to the embedded Google Map below to see if your home is in the WUI. For building permit and planning issues, please verify with your local fire department and building/planning department.


Marin WUI Address Lookup

(NOTE - ThE MARINMAP ADDRESS LOOKUP SERVICE IS TEMPORARILY DISABLED - 2018-04-20) MarinMap, a service provided by public agencies in Marin, provides a WUI lookup tool.  Enter your address in the search bar to find your home.



Note: These maps are recommendations provided by CAL FIRE, and are not necessarily actual designated wildfire severity.  Such zoning designations do not go into effect unless, and until, they are adopted by ordinance by local agencies.  Local agencies are not required to report such zoning actions and CAL FIRE does not have a current list of local agencies that have adopted ordinances establishing Very High Fire Hazard Severity zones within their boundaries.


Cities for which CAL FIRE has made recommendations on Very High Fire Hazard Severity Zones (VHFHSZ):

For city and local agency data, please refer to county data above under Recommended LRA.

map of marin county

State Responsibility Area (SRA):

Adopted, 11/2007:

  • PDF (25 inches x 34.5 inches; 3.0MB)
  • JPG (8.5 inches x 11 inches; 1.2MB)
  • GIS layer (Shapefiles in .zip folder)

map of marin county

Local Responsibility Area (LRA):

Recommended, 10/2008:

  • PDF (25 inches x 34.5 inches; 4.1MB)
  • JPG (8.5 inches x 11 inches; 1.1MB)
  • GIS layer (Shapefiles in .zip folder)

Draft, 9/2007:

  • PDF (25 inches x 34.5 inches; 3.0MB)
  • JPG (8.5 inches x 11 inches; 1.4MB)
  • GIS layer (Shapefiles in .zip folder)

For city and local agency data, please refer to county data above under Recommended LRA.  View details at the CAL FIRE homepage.

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