Contra Costa County, CA
ZIP 94598
In ZIP 94598, 4 of the 12 things we check have at least one part graded D or F.
- Drinking water: Contra Costa Water District meets every EPA legal limit; 13 contaminants are above health goals, led by arsenic at 549× California’s Public Health Goal.
- Closer to Superfund sites than 75% of U.S. neighborhoods, with no listed site within 10 miles of its center.
- Largest share of modeled toxic air from industry: Bio-Rad Laboratories Inc (24%), mostly acrylamide.
- Fine particles (PM2.5) average 9.1 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 94598
- Superfund sites nearbyC to D
- Factories and industrial sitesC to D
- Oil and gas wellsA
- Parks and nature nearbyA to C
- Air qualityB to F
- Drinking water qualityC
- Pesticide useB
- Neighborhood health statusA to B
- Past wildfire impactsA to F
- Past flood impactsA to B
- Noise levelsA to C
- Radiation signalsB to C
Based on 11 census tracts · compiled October 25, 2026 · how each grade works and its sources
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