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San Mateo County and Incorporated Areas Countywide Flood Insurance Rate Map
The final digital Flood Insurance Rate Map for San Mateo County is available for your use at

What should you do with this new digital information? 
  • Be aware that the new maps will be in effect on October 16, 2012.  
  • Download the digital information and integrate it with existing GIS systems and local planning processes.  
  • The DFIRM database that will become effective on October 16, 2012 is available in .kmz file format here.  This file is viewable in Google Earth which must be saved to your desktop for this file extension to work properly.
  • Provide information about the National Flood Insurance Program on your local web site.
Useful Links for use in tandem with the new countywide maps include:
The countywide Flood Insurance Rate Map (FIRM) for San Mateo County and incorporated areas was finalized by Letters of Final Determination (LFD) issued by FEMA on  April 16, 2012.  The LFD is a letter the Federal Emergency Management Agency (FEMA) sends to the Chief Executive Officer of a community stating that a new or updated FIRM will become effective in six months. The FIRM panels will be effective on October 16, 2012.  The map panels and the DFIRM database are available for download here.

Whenever a FIRM change will incorporate new properties into a Special Flood Hazard Area, residents are encouraged to take advantage of the financial benefits offered by voluntarily purchasing low-cost Preferred Risk Policies (PRPs).  Additional information about PRPs can be found at  If you have insurance-related questions, please contact Edie Lohmann.  Edie can be reached by phone at 510-627-7235 or by email at 

If you have additional questions regarding the new maps you can contact Kathy Schaefer by email at

San Mateo County Flood Insurance Rate Maps on FEMA's Map Service Center

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  • Flood Insurance Rate Maps and Flood Insurance Studies: From Preliminary to Effective

    ​FEMA flood hazard maps inform communities about the local flood risk. Flood hazard mapping is an important part of the National Flood Insurance Program (NFIP), as FEMA regulatory products provide the basis for regulating development and determining flood insurance requirements under the NFIP regulations. FEMA maintains and updates regulatory flood hazard data through Flood Insurance Rate Maps (FIRMs) and Flood Insurance Study (FIS) reports.

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