San Joaquin County, CA

ZIP 95304

In ZIP 95304, 12 of the 12 things we check have at least one part graded D or F.

• Drinking water: Western Hills Water District/Diablo Gran meets every EPA legal limit; 11 contaminants are above health goals, led by lead at 30× California’s Public Health Goal.
• Nearest Superfund site: Lawrence Livermore Natl Lab (site 300) (usdoe), 4.7 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Owens-Brockway Glass Container Inc Plant #22 (85%), mostly chromium compounds.
• Fine particles (PM2.5) average 9.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 2,181,002 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 95304

• Superfund sites nearbyA to F
• Factories and industrial sitesB to D
• Oil and gas wellsA to F
• Parks and nature nearbyC to F
• Air qualityB to F
• Drinking water qualityC to F
• Pesticide useF
• Neighborhood health statusA to D
• Past wildfire impactsC to F
• Past flood impactsB to F
• Noise levelsA to D
• Radiation signalsC to D

Based on 9 census tracts · compiled September 10, 2026 · how each grade works and its sources

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