FEMA flood zone rules in Williamson County, TX — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Williamson County participates in the National Flood Insurance Program and enforces floodplain development permits in unincorporated areas. Any construction, fill, or improvement in a FEMA-mapped special flood hazard area requires a county floodplain development permit before work begins.
Williamson County adopted floodplain management regulations to qualify for the National Flood Insurance Program, as authorized by Texas Water Code Section 16.315. The county floodplain administrator reviews development in FEMA-mapped special flood hazard areas along the San Gabriel River, Brushy Creek, and their tributaries. New or substantially improved structures in the floodplain must have their lowest floor elevated to or above the base flood elevation, documented with an elevation certificate. Fill, grading, and stream crossings in the floodplain also require review to avoid raising flood levels on neighboring property.
Building or placing fill in the floodplain without a floodplain development permit exposes the owner to enforcement, mandatory removal, and loss of flood-insurance eligibility for the structure.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Williamson County's flood zones rules stack up against other locations.
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