Williamson County, TX

ZIP 76511

In ZIP 76511, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Jonah Water Sud has 3 contaminants at or over an EPA legal limit; 19 contaminants are above health goals, led by pfos at 5.4× California’s Public Health Goal.
• Closer to Superfund sites than 54% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Delta Centrifugal LLC (40%), mostly chromium compounds.
• Fine particles (PM2.5) average 7.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 204,705 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 76511

• Superfund sites nearbyA to C
• Factories and industrial sitesA to B
• Oil and gas wellsA to F
• Parks and nature nearbyC to D
• Air qualityC
• Drinking water qualityC to F
• Pesticide useF
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsA to B
• Noise levelsA
• Radiation signalsB to C

Based on 5 census tracts · compiled September 10, 2026 · how each grade works and its sources

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