Bexar County, TX

ZIP 78256

In ZIP 78256, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Stagecoach Hills meets every EPA legal limit; 9 contaminants are above health goals, led by bromodichloromethane at 149× California’s Public Health Goal.
• Nearest Superfund site: Bandera Road Ground Water Plume, 7.8 miles away.
• Largest share of modeled toxic air from industry: Calaveras Power Station (41%), 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 78256

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

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

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