FEMA flood zone rules in Sioux Falls, SD — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Sioux Falls has significant flood zones along the Big Sioux River and its tributaries. The city participates in FEMA's National Flood Insurance Program (NFIP) and enforces strict floodplain development regulations. New construction in the floodplain must be elevated above the base flood elevation.
The Big Sioux River corridor and Skunk Creek areas contain FEMA-designated 100-year floodplains. Development in flood zones requires a floodplain development permit. New residential structures must have the lowest floor elevated at least one foot above the base flood elevation (BFE). Substantial improvements to existing structures in the floodplain must also meet elevation requirements. The city maintains updated flood maps and provides floodplain information through the Engineering Division.
Construction below flood elevation: retroactive compliance required, fines $500 to $5,000. Floodway encroachment: removal order. Failure to maintain flood insurance: lender force-placement at higher cost.
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See how Sioux Falls's flood zones rules stack up against other locations.
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