FEMA flood zone rules in South San Francisco, CA — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Parts of South San Francisco near the Bay shoreline and low-lying industrial areas are in FEMA flood zones. New construction in Special Flood Hazard Areas requires elevation and a floodplain development permit. Sea level rise is a key risk.
South San Francisco participates in the National Flood Insurance Program (NFIP). FEMA-designated Special Flood Hazard Areas (Zone AE/AO) exist along the Bay shoreline and in lower-elevation areas, particularly near the industrial/biotech corridor adjacent to the Bay. Properties in flood zones require flood insurance for federally-backed mortgages. New construction must comply with Base Flood Elevation requirements and requires a floodplain development permit from Engineering. Sea level rise poses increasing risk to bayfront areas. Check FEMA's Flood Map Service Center (msc.fema.gov) for property-specific status.
Construction below flood elevation: retroactive compliance required, fines $500 to $5,000. Floodway encroachment: removal order. Failure to maintain flood insurance: lender force-placement at higher cost.
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Side-by-side rule comparisons with other cities in San Mateo County.
See how other cities in San Mateo County handle flood zones.
See how South San Francisco's flood zones rules stack up against other locations.
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