Contra Costa County, CA

ZIP 94553

In ZIP 94553, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of Martinez meets every EPA legal limit; 11 contaminants are above health goals, led by arsenic at 546× California’s Public Health Goal.
• Nearest Superfund site: Concord Naval Weapons Station, 1.4 miles away.
• Largest share of modeled toxic air from industry: Martinez Refining Co LLC (63%), mostly nickel compounds.
• Fine particles (PM2.5) average 9.5 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 94553

• Superfund sites nearbyC to F
• Factories and industrial sitesC to F
• Oil and gas wellsA to F
• Parks and nature nearbyB to C
• Air qualityB to F
• Drinking water qualityC
• Pesticide useB to C
• Neighborhood health statusA to C
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsA to B

Based on 17 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…