Hays County, TX

ZIP 78666

In ZIP 78666, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Springs Hill Sud has 1 contaminant at or over an EPA legal limit; 19 contaminants are above health goals, led by pfos at 4.4× 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: Structural Metals Inc (54%), mostly chromium compounds.
• Fine particles (PM2.5) average 7.9 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 28,850 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 78666

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

Based on 27 census tracts · compiled September 10, 2026 · how each grade works and its sources

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