FEMA flood zone rules in Franklin County, OH — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Franklin County flood hazards concentrated along Scioto River, Olentangy River, Big Walnut Creek, and Alum Creek. FEMA FIRM panels updated 2019. Floodplain development requires permit through Franklin County Engineer or municipal floodplain administrator. NFIP participation mandatory.
Franklin County participates in FEMA National Flood Insurance Program with FIRM panels effective June 17, 2019. Major flood zones: Scioto River through downtown Columbus (1913 flood of record), Olentangy River through campus area, Big Walnut Creek through eastern county, Alum Creek watershed. Columbus participates in Community Rating System (CRS) Class 6 providing 20 percent flood insurance discount. New construction in Special Flood Hazard Area (SFHA) must be elevated 1-2 ft above Base Flood Elevation (freeboard requirement). Substantial improvement rule triggers full compliance if renovation exceeds 50 percent of structure value.
Building in floodplain without permit: 500-5,000 dollars plus required elevation or removal. Fill placement without permit: restoration order. NFIP non-compliance can void flood insurance coverage. Substantial damage determination may require demolition.
Franklin County, OH
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See how Franklin County's flood zones rules stack up against other locations.
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