Texas counties cannot zone, so unincorporated Williamson County has no general grading ordinance. Placing fill or altering drainage inside a mapped floodplain still requires a county floodplain development permit under state floodplain law.
Outside the floodplain, unincorporated Williamson County does not require grading or drainage permits, because Texas counties lack general land-use authority. Inside FEMA-mapped floodplains, grading, fill, and drainage changes require a floodplain development permit so the county can confirm the work does not raise the base flood elevation on adjacent land. Subdivision plats reviewed by the county must show drainage that does not divert concentrated runoff onto neighboring tracts. On the Edwards Aquifer recharge zone, grading is also a regulated activity under the TCEQ water-quality rules in 30 TAC Chapter 213.
Diverting concentrated stormwater onto a neighbor can create civil liability for drainage damage. Grading or filling in the floodplain without a permit triggers county enforcement and required restoration.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Williamson County, TX
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See how Williamson County's grading & drainage rules stack up against other locations.
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