Bexar County, TX

ZIP 78233

In ZIP 78233, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of Selma meets every EPA legal limit; 10 contaminants are above health goals, led by lead at 11× California’s Public Health Goal.
• Nearest Superfund site: Eldorado Chemical Co., Inc., 2.1 miles away.
• Largest share of modeled toxic air from industry: Central Texas Iron Works - Schertz (47%), mostly chromium.
• Fine particles (PM2.5) average 8.9 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 78233

• Superfund sites nearbyD to F
• Factories and industrial sitesB to C
• Oil and gas wellsB to D
• Parks and nature nearbyD to F
• Air qualityD to F
• Drinking water qualityD
• Pesticide useB to D
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsC

Based on 12 census tracts · compiled September 10, 2026 · how each grade works and its sources

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