Bexar County, TX

ZIP 78257

In ZIP 78257, 1 of the 12 things we check have at least one part graded D or F.

• Drinking water: Enchanted Oaks Wsc meets every EPA legal limit; 6 contaminants are above health goals, led by tetrachloroethylene at 21× California’s Public Health Goal.
• Nearest Superfund site: Bandera Road Ground Water Plume, 9.8 miles away.
• Largest share of modeled toxic air from industry: Calaveras Power Station (40%), mostly chromium.
• Fine particles (PM2.5) average 8.4 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 58,581 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 78257

• Superfund sites nearbyA to C
• Factories and industrial sitesA to B
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityB to D
• Drinking water qualityA to C
• Pesticide useB to C
• Neighborhood health statusA to C
• Past wildfire impactsA
• Past flood impactsA to C
• Noise levelsA
• Radiation signalsA to B

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

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