FEMA flood zone rules in Chico, CA — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Chico participates in the National Flood Insurance Program (NFIP) and adopts FEMA Flood Insurance Rate Maps (FIRMs) for Butte County. Construction in Special Flood Hazard Areas (SFHAs — Zones A, AE, AO) along Big Chico Creek, Little Chico Creek, Lindo Channel, Mud Creek, and Sycamore Creek must comply with California Code of Regulations Title 23 Division 5 floodplain management standards.
Within a designated SFHA, the lowest floor of new or substantially improved residential structures must be elevated at least 1 foot above the Base Flood Elevation (BFE) per CCR Title 23 §2900 et seq. Substantial improvement (cumulative work valued at 50% or more of pre-improvement market value) triggers full compliance, as does substantial damage. Non-residential structures may be dry-floodproofed. Fill, grading, and structures in the regulatory floodway are prohibited if they cause any increase in flood elevations (no-rise certification required). Letters of Map Amendment (LOMA) and Map Revisions (LOMR) are processed through FEMA.
Building or filling in a SFHA without a floodplain development permit is a code violation; NFIP non-compliance can result in community suspension and loss of federally backed flood insurance. Property owners face FEMA enforcement and increased Risk Rating 2.0 premiums.
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