San Joaquin County, CA

ZIP 95231

In ZIP 95231, 11 of the 12 things we check have at least one part graded D or F.

• Drinking water: Defense Distrib. Depot, Sharpe Site has 3 contaminants at or over an EPA legal limit; 14 contaminants are above health goals, led by mercury (inorganic) at 127× European Union Drinking Water Directive.
• Nearest Superfund site: Sharpe Army Depot, 2.1 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Owens-Brockway Glass Container Inc Plant #22 (57%), mostly chromium compounds.
• Fine particles (PM2.5) average 9.8 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 95231

• Superfund sites nearbyF
• Factories and industrial sitesD
• Oil and gas wellsD to F
• Parks and nature nearbyD to F
• Air qualityD to F
• Drinking water qualityD to F
• Pesticide useF
• Neighborhood health statusB to C
• Past wildfire impactsC to F
• Past flood impactsF
• Noise levelsA to D
• Radiation signalsD

Based on 3 census tracts · compiled September 10, 2026 · how each grade works and its sources

Loading the full report, with every source…