Contra Costa County, CA

ZIP 94588

In ZIP 94588, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Doubletree Ranch Water System has 1 contaminant at or over an EPA legal limit; 5 contaminants are above health goals, led by lead at 71× California’s Public Health Goal.
• Nearest Superfund site: Lawrence Livermore Natl Lab, Main Site (usdoe), 6.0 miles away.
• Largest share of modeled toxic air from industry: Tesla Inc. (32%), mostly cobalt compounds.
• Fine particles (PM2.5) average 8.8 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 94588

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

Based on 13 census tracts · compiled September 10, 2026 · how each grade works and its sources

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