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Williamson County, TX Environmental Rules: Erosion Control (2026)

Light Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

Recharge Zone
BMPs required under 213
CGP Sites
SWPPP erosion controls
Common BMPs
Silt fence, inlet protection
Threshold
1 acre disturbed

Summary

On the Edwards Aquifer recharge zone, clearing and excavation are regulated activities under 30 TAC Chapter 213 and require approved erosion and sediment controls. Construction General Permit sites of one acre or more need a stormwater pollution prevention plan with erosion best management practices.

City-specific rules exist: Cedar Park, and Round Rock have their own erosion control rules that differ from Williamson County's county-level regulations. If you live in one of those cities, check the city-specific page instead.

construction of buildings, utility stations, utility lines, roads, highways, or railroads; clearing, excavation, or any other activities that alter or disturb the topographic, geologic, or existing recharge characteristics of a site.

Source: Texas StatutesView official code

Full Breakdown

Erosion and sediment control in Williamson County is driven by two state programs. Over the Edwards Aquifer recharge zone, clearing, excavation, and grading that disturb site topography are regulated activities that require TCEQ-approved temporary and permanent best management practices. Statewide, any construction disturbing one acre or more must implement the erosion and sediment controls described in its stormwater pollution prevention plan under the TXR150000 Construction General Permit. Silt fences, stabilized construction entrances, and inlet protection are standard temporary controls kept in place until the site is stabilized.

Violations & Fines

Failing to install or maintain required erosion controls on a permitted site draws TCEQ penalties and stop-work orders. Sediment leaving a recharge-zone site can contaminate the aquifer and compound liability.

Frequently Asked Questions

Are erosion controls required on small lots?
Sites under one acre off the recharge zone are not covered by the Construction General Permit. Regulated activities on the recharge zone need controls regardless of the acreage threshold.
How long must erosion controls stay in place?
Until the disturbed area is finally stabilized with permanent cover. Removing them early violates the stormwater pollution prevention plan.

Sources & Official References

Other rules in Williamson County

Animal Ordinances: Dog Leash LawsFew RestrictionsAnimal Ordinances: Chickens & LivestockFew RestrictionsFlood ZonesLight RestrictionsStormwater ManagementLight RestrictionsAnimal Ordinances: Exotic PetsLight RestrictionsAnimal Ordinances: Breed RestrictionsFew RestrictionsLandscaping Rules: Artificial TurfFew RestrictionsLandscaping Rules: Native PlantsFew Restrictions

All Williamson County rules

Texas rules heatmap·Compare Williamson County to another location·View the Texas environmental rules overview

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Erosion Control in Cities Across Williamson County

Round Rock, TXCedar Park, TX