Contra Costa County, CA
ZIP 94521
In ZIP 94521, 8 of the 12 things we check have at least one part graded D or F.
- Drinking water: City Of Pittsburg meets every EPA legal limit; 16 contaminants are above health goals, led by lead at 16× California’s Public Health Goal.
- Nearest Superfund site: Concord Naval Weapons Station, 5.9 miles away.
- Largest share of modeled toxic air from industry: Shell Catalysts & Technologies - Pittsburg (19%), mostly nickel compounds.
- Fine particles (PM2.5) average 8.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
- About 98,092 kg of agricultural pesticides are applied in the county each year.
Grades for ZIP 94521
- Superfund sites nearbyD to F
- Factories and industrial sitesC to D
- Oil and gas wellsA to D
- Parks and nature nearbyB to F
- Air qualityC to F
- Drinking water qualityD
- Pesticide useC to D
- Neighborhood health statusB to C
- Past wildfire impactsA to C
- Past flood impactsA to B
- Noise levelsA to C
- Radiation signalsC to D
Based on 14 census tracts · compiled September 10, 2026 · how each grade works and its sources
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