Contra Costa County, CA

ZIP 94806

In ZIP 94806, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: East Bay Mud meets every EPA legal limit; 9 contaminants are above health goals, led by pfos at 1.4× California’s Public Health Goal.
• Nearest Superfund site: United Heckathorn Co., 5.0 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Chevron Products Co Richmond Refinery (56%), mostly acrylamide.
• Fine particles (PM2.5) average 9.2 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 94806

• Superfund sites nearbyC to D
• Factories and industrial sitesC to D
• Oil and gas wellsA
• Parks and nature nearbyB to C
• Air qualityC to F
• Drinking water qualityC
• Pesticide useB to D
• Neighborhood health statusA to B
• 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

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