All of Isleton sits within FEMA Special Flood Hazard Area designations and is protected by Delta levees. Senate Bill 5 requires 200-year flood protection for urban development. Flood insurance mandatory for federally-backed mortgages. New construction must elevate above base flood elevation or face non-residential floodproofing.
Isleton is entirely surrounded by water and sits behind Delta levees that protect the city from the Sacramento River, Georgiana Slough, and numerous minor sloughs. The entire city is mapped in FEMA Special Flood Hazard Areas on the current Flood Insurance Rate Maps for Sacramento County. Senate Bill 5, signed in 2007 after Hurricane Katrina, requires urban and urbanizing areas in the Sacramento-San Joaquin Valley to achieve 200-year flood protection before approving new development. The California Department of Water Resources and Central Valley Flood Protection Board certify levee systems. Federal flood insurance through the National Flood Insurance Program is mandatory for any home with a federally-backed mortgage in the SFHA. New construction must elevate the lowest floor to or above the base flood elevation or use approved floodproofing for non-residential structures. Substantial improvements exceeding 50 percent of structure value trigger full code compliance.
Construction without floodplain development permit: stop-work, NFIP enforcement, and potential loss of community flood insurance eligibility.
See how other cities in Sacramento County handle flood zones.
See how Isleton's flood zones rules stack up against other locations.
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