Unincorporated Brazoria County has no retaining-wall zoning ordinance. In new subdivisions the county may set drainage standards under state law, and cities regulate walls through building permits. On this Gulf coast, flood and drainage rules matter most.
Texas counties can't zone, so Brazoria County has no standalone retaining-wall height ordinance for existing unincorporated lots. Where the county does act is subdivision development: under Local Government Code 232.003 the commissioners court may adopt drainage specifications for new subdivisions. Retaining walls that affect drainage or floodplains can trigger the county's floodplain-management permit (NFIP). Inside cities, a building permit and engineering review apply. Because Brazoria County is hurricane- and flood-prone, drainage and floodplain review usually govern walls more than any height rule.
Altering drainage or building in a floodplain without required county floodplain permits can bring stop-work orders and NFIP compliance action. No county wall-height penalty applies otherwise.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Pearland's retaining walls rules stack up against other locations.
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