FEMA flood zone rules in Allegheny County, PA — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Allegheny County has extensive FEMA-mapped floodplains along the Allegheny, Monongahela, and Ohio Rivers plus dozens of tributary creeks. Downtown Pittsburgh Point area sits in 100-year floodplain. NFIP participation required countywide.
All Allegheny County municipalities participate in the National Flood Insurance Program (NFIP) with locally adopted floodplain ordinances meeting 44 CFR 60.3 minimum standards. FEMA Flood Insurance Rate Maps (FIRMs) were updated 2014-2021 for most of the county. Downtown Pittsburgh Point area including PNC Park approaches, Heinz Field, and the Mon Wharf is in Zone AE (1% annual chance). Construction in Special Flood Hazard Areas (SFHAs) requires elevation to base flood elevation plus freeboard (typically 1.5 to 2 ft). Etna, Millvale, Sharpsburg, Aspinwall along Allegheny River and Homestead, McKeesport, West Mifflin along Monongahela are flood-prone. Three Rivers confluence creates unique flood risk from combined upstream basins. Historic floods include 1936 Saint Patrick's Day Flood and Hurricane Ivan 2004.
Unpermitted floodplain construction: 500 to 10,000 dollars plus removal. NFIP non-compliance can suspend community flood insurance eligibility.
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See how Allegheny County's flood zones rules stack up against other locations.
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