Williamson County, TX

ZIP 76578

In ZIP 76578, 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 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Giddings Gas Plant (43%), mostly formaldehyde.
• Fine particles (PM2.5) average 7.4 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 76578

• Superfund sites nearbyA
• Factories and industrial sitesA to B
• Oil and gas wellsD to F
• Parks and nature nearbyD
• Air qualityC
• Drinking water qualityC to F
• Pesticide useF
• Neighborhood health statusC to D
• Past wildfire impactsA
• Past flood impactsB
• Noise levelsA to C
• Radiation signalsC

Based on 2 census tracts · compiled September 10, 2026 · how each grade works and its sources

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