Williamson County, TX

ZIP 78729

In ZIP 78729, 1 of the 12 things we check have at least one part graded D or F.

• Drinking water: North Austin Mud 1 meets every EPA legal limit; 8 contaminants are above health goals, led by bromodichloromethane at 211× 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 (84%), mostly polycyclic aromatic compounds.
• Fine particles (PM2.5) average 8.9 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 78729

• Superfund sites nearbyA
• Factories and industrial sitesA to B
• Oil and gas wellsC
• Parks and nature nearbyB
• Air qualityD to F
• Drinking water qualityC
• Pesticide useB to C
• Neighborhood health statusA
• Past wildfire impactsA
• Past flood impactsB
• Noise levelsA to C
• Radiation signalsA to B

Based on 6 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…