Contra Costa County, CA

ZIP 94803

In ZIP 94803, 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; 13 contaminants are above health goals, led by lead at 48× California’s Public Health Goal.
• Nearest Superfund site: Liquid Gold Oil Corp., 3.3 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Chevron Products Co Richmond Refinery (47%), mostly acrylamide.
• Fine particles (PM2.5) average 8.5 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 94803

• Superfund sites nearbyC to D
• Factories and industrial sitesD
• Oil and gas wellsA to B
• Parks and nature nearbyB to D
• Air qualityB to D
• Drinking water qualityD to F
• Pesticide useC
• Neighborhood health statusB
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to C
• Radiation signalsB to C

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

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