FEMA flood zone rules in Napa, CA — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Napa's Floodplain Management Overlay District is Chapter 17.38 of the Municipal Code. The city's Special Flood Hazard Areas were last revised by FEMA's post-bypass Letter of Map Revision (LOMR 16-09-1316P), effective January 22, 2019, reflecting completion of the Napa River-Napa Creek Flood Protection Project.
Chapter 17.38 implements the National Flood Insurance Program (44 CFR Parts 59-60) and California Government Code Section 8589.5 floodplain management requirements. Napa's Special Flood Hazard Areas were originally mapped in the FIS dated September 26, 2008, and substantially revised by FEMA Letter of Map Revision LOMR 16-09-1316P effective January 22, 2019 after completion of the Napa River-Napa Creek Flood Protection Project (1998-2016, Measure A). The Napa Creek Bypass (2012) and the dry Napa River Bypass (2016) removed large portions of downtown Napa from the regulatory floodplain. New construction and substantial improvements in Zone A/AE must be elevated at or above the Base Flood Elevation, use flood-resistant materials, and obtain a floodplain development permit. The city participates in FEMA's Community Rating System at Class 7, giving SFHA policyholders a 15% NFIP premium discount.
Building, filling, or substantially improving a structure in a Napa SFHA without a floodplain development permit under Chapter 17.38 violates city code and FEMA's NFIP rules. FEMA can suspend Napa from the NFIP, which would end federally backed flood insurance citywide. The city can require elevation, demolition, or denial of certificates of occupancy.
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