FEMA flood zone rules in Williamson County, TN — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Williamson County enforces floodplain standards through its zoning ordinance to stay in the National Flood Insurance Program. New buildings in a Special Flood Hazard Area must sit at least one foot above base flood elevation.
Recurrent flooding along the Harpeth River and its tributaries makes floodplain management a real constraint. Under Zoning Ordinance Section 7111, new construction or substantial improvement of any residential building must have its lowest floor, including basement, elevated at least one foot above the base flood elevation, matching Tennessee's model ordinance and NFIP rules. Non-residential buildings must elevate or floodproof. Fill and new structures are barred in the regulatory floodway. Substantial improvements exceeding 50% of market value trigger full compliance. FEMA maps and unmapped-stream provisions both apply.
Building below the required flood elevation forces retroactive compliance and fines; encroaching on the floodway brings removal orders. Losing NFIP good standing can raise flood-insurance costs county-wide.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Williamson County, TN
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See how Williamson County's flood zones rules stack up against other locations.
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