Bexar County, TX

ZIP 78233

In ZIP 78233, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Saws Northeast meets every EPA legal limit; 8 contaminants are above health goals, led by lithium at 4.1× the USGS health-based screening level.
• Nearest Superfund site: Eldorado Chemical Co., Inc., 2.1 miles away.
• Largest share of modeled toxic air from industry: Central Texas Iron Works - Schertz (36%), 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 sitesA to D
• Oil and gas wellsB to D
• Parks and nature nearbyB to D
• Air qualityD to F
• Drinking water qualityB to C
• Pesticide useB to C
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsB

Based on 12 census tracts · compiled October 25, 2026 · how each grade works and its sources

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