Bexar County, TX

ZIP 78234

In ZIP 78234, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Jbsa Sam Houston meets every EPA legal limit; 13 contaminants are above health goals, led by lead at 130× California’s Public Health Goal.
• Nearest Superfund site: R & H Oil/tropicana Energy, 8.1 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Calaveras Power Station (39%), mostly chromium compounds.
• Fine particles (PM2.5) average 9.3 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 78234

• Superfund sites nearbyA
• Factories and industrial sitesD
• Oil and gas wellsC
• Parks and nature nearbyD
• Air qualityF
• Drinking water qualityD to F
• Pesticide useC
• Neighborhood health statusA
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsC

Based on 1 census tract · compiled September 10, 2026 · how each grade works and its sources

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