Williamson County, TX
ZIP 78664
In ZIP 78664, 7 of the 12 things we check have at least one part graded D or F.
- Drinking water: City Of Pflugerville has 2 contaminants at or over an EPA legal limit; 15 contaminants are above health goals, led by pfoa at 586× California’s Public Health Goal.
- Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
- Largest share of modeled toxic air from industry: Tesla Giga Texas (75%), mostly polycyclic aromatic compounds.
- Fine particles (PM2.5) average 8.7 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 78664
- Superfund sites nearbyA
- Factories and industrial sitesB to F
- Oil and gas wellsC to D
- Parks and nature nearbyB to C
- Air qualityC to F
- Drinking water qualityC to F
- Pesticide useB to F
- Neighborhood health statusA to C
- Past wildfire impactsA
- Past flood impactsB
- Noise levelsA to D
- Radiation signalsB to D
Based on 20 census tracts · compiled October 25, 2026 · how each grade works and its sources
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