FEMA flood zone rules in Walnut Creek, CA — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Walnut Creek has significant FEMA Special Flood Hazard Areas along Walnut Creek (the watercourse), Las Trampas Creek, San Ramon Creek, and Pine Creek. Much of the Pine Creek corridor is mapped as Zone AE requiring flood insurance and elevated construction standards.
Walnut Creek is traversed by several creeks that create FEMA Special Flood Hazard Areas (SFHAs). Pine Creek, which runs through residential areas of Walnut Creek, has substantial portions mapped as Zone AE (1% annual chance flood, base flood elevations determined). Walnut Creek the watercourse, Las Trampas Creek, and San Ramon Creek also have mapped floodplains. The City participates in the National Flood Insurance Program (NFIP) and enforces floodplain management standards through Municipal Code Title 8 (Health and Safety) floodplain provisions. New construction and substantial improvements (50%+ of market value) in SFHAs must have lowest floor elevated to or above the Base Flood Elevation (BFE), typically with 1 foot of freeboard. Fill, grading, and obstructions in the floodway are prohibited. Contra Costa County Flood Control and Water Conservation District operates regional flood control infrastructure along the Walnut Creek watershed. Federally-backed mortgages in SFHAs require flood insurance. Elevation Certificates are required for permits in SFHAs. The Contra Costa County FEMA maps (effective 2009, with updates) should be consulted along with LOMAs/LOMRs for individual properties.
Contact your local code enforcement office for specific penalty information.
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Side-by-side rule comparisons with other cities in Contra Costa County.
See how other cities in Contra Costa County handle flood zones.
See how Walnut Creek's flood zones rules stack up against other locations.
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