Bexar County, TX

ZIP 78251

In ZIP 78251, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Saws Texas Research Park meets every EPA legal limit; 7 contaminants are above health goals, led by bromodichloromethane at 59× California’s Public Health Goal.
• Nearest Superfund site: Bandera Road Ground Water Plume, 1.9 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Arvin Sango (49%), mostly chromium.
• Fine particles (PM2.5) average 9.1 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 78251

• Superfund sites nearbyC to F
• Factories and industrial sitesB to C
• Oil and gas wellsA to B
• Parks and nature nearbyB to D
• Air qualityD to F
• Drinking water qualityC
• Pesticide useB to C
• Neighborhood health statusA to D
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsB

Based on 16 census tracts · compiled October 25, 2026 · how each grade works and its sources

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