FEMA flood zone rules in Castro Valley, CA — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Alameda County participates in NFIP. FEMA maps designate Special Flood Hazard Areas along the Bay shoreline in Oakland, Alameda, San Leandro, Hayward, and creek corridors countywide.
Flood zones in Alameda County are mapped by FEMA under the National Flood Insurance Program (NFIP). The county Public Works Agency administers floodplain management in unincorporated areas under Title 13 of the Alameda County Code, enforcing FEMA minimum standards and Community Rating System improvements. Special Flood Hazard Areas (Zone A, AE, VE) include the San Francisco Bay shoreline in Oakland, Alameda city, San Leandro, and Hayward, plus creek corridors along Alameda Creek, San Lorenzo Creek, and Arroyo de la Laguna. New construction or substantial improvement (50 percent of market value) in SFHAs must elevate the lowest floor to or above the Base Flood Elevation. Coastal VE zones require breakaway walls and pile foundations. Flood insurance is mandatory for federally-backed mortgages in SFHAs. The county participates in CRS, earning flood insurance discounts for residents. Sea level rise planning adds future risk to Bay shoreline properties.
Contact your local code enforcement office for specific penalty information.
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Side-by-side rule comparisons with other cities in Alameda County.
See how other cities in Alameda County handle flood zones.
See how Castro Valley's flood zones rules stack up against other locations.
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