FEMA flood zone rules in Harrison County, MS — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Harrison County enforces FEMA floodplain rules with Katrina-hardened standards. Most coastal properties are in VE or AE zones requiring elevation above Base Flood Elevation plus 1-2 feet freeboard. Flood insurance mandatory.
Harrison County participates in the National Flood Insurance Program with Community Rating System Class 7 or better in Gulfport and Biloxi, earning policyholder discounts. After Hurricane Katrina (2005) rewrote coastal flood maps, most of southern Harrison County was reclassified into VE (velocity/wave) or AE (floodwater) Special Flood Hazard Areas. New construction and substantial improvements (work exceeding 50% of market value) must be elevated with lowest floor at or above Base Flood Elevation plus local freeboard (commonly +1 to +2 feet above BFE in Gulfport and Biloxi). VE zones require breakaway walls, pile or column foundations, and flood vents. Floodway encroachment is prohibited. Fill for residential use in VE zones is not allowed. Flood insurance is mandatory for federally-backed mortgages in SFHA; Harrison County averages over 30,000 active policies. Preliminary FEMA flood maps continue to evolve with Gulf of Mexico sea-level rise projections.
Below-BFE construction: retroactive elevation required + $500-$5,000. Floodway encroachment: removal order + daily fines. Substantial improvement without elevation: permit revocation, insurance issues. Fill in VE zone: violation of NFIP; community probation risk.
Harrison County, MS
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See how Harrison County's flood zones rules stack up against other locations.
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