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.
Round Rock, TX
Round Rock restricts construction noise to 7 AM–7 PM Monday through Friday. Weekend and holiday construction outside these hours is prohibited under the nois...
Round Rock, TX
Round Rock Code Chapter 14, Article VIII establishes time-based quiet hours and uses a 'plainly audible' standard. Quiet hours run 10 PM–7 AM on weekdays and...
Round Rock, TX
Round Rock Chapter 14 and Chapter 4 (Animals) address barking dogs as a public nuisance. Persistent barking that unreasonably disturbs neighbors is enforceab...
Round Rock, TX
Round Rock requires driveways to comply with impervious cover limits and obtain permits for new or expanded driveway construction. Vehicles may be parked on ...
Round Rock, TX
Round Rock allows residential street parking subject to standard restrictions. Vehicles must face the direction of traffic, park no closer than 15 feet from ...
Round Rock, TX
Round Rock restricts commercial vehicle and heavy equipment parking in residential zones. Large commercial trucks and equipment may not be regularly stored o...
Side-by-side rule comparisons with other cities in Williamson County.
See how Round Rock's grading & drainage rules stack up against other locations.
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