San Joaquin County, CA

ZIP 95203

In ZIP 95203, 10 of the 12 things we check have at least one part graded D or F.

• Drinking water: San Joaquin County-Mokelumne Acres has 3 contaminants at or over an EPA legal limit; 13 contaminants are above health goals, led by arsenic at 1,192× California’s Public Health Goal.
• Nearest Superfund site: Mccormick & Baxter Creosoting Co., 1.7 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Owens-Brockway Glass Container Inc Plant #22 (49%), mostly chromium compounds.
• Fine particles (PM2.5) average 9.1 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 4,500,402 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 95203

• Superfund sites nearbyD to F
• Factories and industrial sitesD to F
• Oil and gas wellsA to F
• Parks and nature nearbyC
• Air qualityD to F
• Drinking water qualityC to F
• Pesticide useF
• Neighborhood health statusA to F
• Past wildfire impactsA to C
• Past flood impactsC to D
• Noise levelsA to D
• Radiation signalsD

Based on 10 census tracts · compiled October 25, 2026 · how each grade works and its sources

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