Bexar County, TX

ZIP 78255

In ZIP 78255, none of the 12 things we check has a part graded D or F.

• Drinking water: The Oaks Wsc meets every EPA legal limit; 8 contaminants are above health goals, led by bromodichloromethane at 92× California’s Public Health Goal.
• Nearest Superfund site: Bandera Road Ground Water Plume, 7.7 miles away.
• Largest share of modeled toxic air from industry: Calaveras Power Station (39%), mostly chromium.
• Fine particles (PM2.5) average 7.5 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 78255

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

Based on 5 census tracts · compiled October 25, 2026 · how each grade works and its sources

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