Contra Costa County, CA

ZIP 94505

In ZIP 94505, 10 of the 12 things we check have at least one part graded D or F.

• Drinking water: Santa Clara Valley Water District meets every EPA legal limit; 14 contaminants are above health goals, led by pfos at 3.7× California’s Public Health Goal.
• Nearest Superfund site: Lawrence Livermore Natl Lab, Main Site (usdoe), 6.6 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Owens-Brockway Glass Container Inc Plant #22 (49%), mostly chromium compounds.
• Fine particles (PM2.5) average 8.1 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 94505

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

Based on 7 census tracts · compiled September 10, 2026 · how each grade works and its sources

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