Bexar County, TX

ZIP 78258

In ZIP 78258, 2 of the 12 things we check have at least one part graded D or F.

• Drinking water: Oak North Mobile Homes Estates meets every EPA legal limit; 8 contaminants are above health goals, led by bromodichloromethane at 70× California’s Public Health Goal.
• Nearest Superfund site: Eldorado Chemical Co., Inc., 6.7 miles away.
• Largest share of modeled toxic air from industry: Central Texas Iron Works - Schertz (37%), mostly chromium.
• Fine particles (PM2.5) average 8.1 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 78258

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

Based on 14 census tracts · compiled October 25, 2026 · how each grade works and its sources

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