FEMA flood zone rules in Sonoma, CA — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Sonoma participates in the National Flood Insurance Program and regulates development in FEMA-mapped Special Flood Hazard Areas through Chapter 14.25 of the Municipal Code.
Sonoma Municipal Code Chapter 14.25 (Floodplain Management Regulations) governs all development in flood hazard areas as delineated on the current FEMA Flood Insurance Rate Map (FIRM). SMC 14.25.480 adopts FEMA definitions for FIRM, Flood Insurance Study, Base Flood, and Special Flood Hazard Area. SMC 14.25.160 designates a Floodplain Administrator who must review every permit application to determine whether proposed development is located in a flood hazard area, verify compliance with the chapter, and require that development be reasonably safe from flooding using methods that minimize flood damage. A permit for floodplain development (Article IV) is required before any building, grading, mining, dredging, filling, excavation, drilling, or storage of equipment or materials in a Special Flood Hazard Area. SMC 14.25.240 authorizes the Floodplain Administrator to suspend or revoke a permit issued in error, on inaccurate information, or in violation of these regulations. Records of base flood elevation and Elevation Certificates must be maintained under SMC 14.25.370.
Development without a floodplain permit, or in violation of conditions, is a misdemeanor under the Municipal Code. The Floodplain Administrator may issue stop-work orders, suspend or revoke permits, and pursue civil abatement. Noncompliance can also jeopardize the city's NFIP standing, raising flood insurance premiums citywide. Federal flood disaster assistance can be reduced or denied for substantially damaged structures rebuilt out of compliance.
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