Los Angeles County, CA

ZIP 90803

In ZIP 90803, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of Seal Beach meets every EPA legal limit; 12 contaminants are above health goals, led by arsenic at 523× California’s Public Health Goal.
• Nearest Superfund site: Ralph Gray Trucking Co., 7.6 miles away.
• Largest share of modeled toxic air from industry: Certified Alloy Products Inc (63%), mostly cobalt.
• Fine particles (PM2.5) average 11.6 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 250,208 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 90803

• Superfund sites nearbyA to D
• Factories and industrial sitesF
• Oil and gas wellsF
• Parks and nature nearbyD to F
• Air qualityF
• Drinking water qualityD
• Pesticide useB to D
• Neighborhood health statusA to C
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D

Based on 16 census tracts · compiled September 10, 2026 · how each grade works and its sources

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