San Mateo County Hazards | FEMA Flood Zones
Flood zones are geographic areas that FEMA has defined according to varying levels of flood risk and type of flooding. These zones are depicted on the published Flood Insurance Rate Map (FIRM) or Flood Hazard Boundary Map (FHBM). Flood Zones are derived from Digital Flood Insurance Rate Map (DFIRM) provided by FEMA. The map became effective on Oct 16, 2012. The map became effective on October 16, 2012. Flood zones are overlayed on County Parcels, should you see any discrepancies between this map and other Flood Map resources, please notify Annie He in the Planning and Building Department at 650-363-1827. To obtain flood zone and/or other Planning information for your specific property, please use the Planning GIS program.