Orange County, CA

ZIP 90623

In ZIP 90623, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of La Palma meets every EPA legal limit; 12 contaminants are above health goals, led by lead at 32× California’s Public Health Goal.
• Nearest Superfund site: Mccoll, 4.8 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Certified Alloy Products Inc (22%), mostly cobalt.
• Fine particles (PM2.5) average 12.1 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 206,209 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 90623

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

Based on 8 census tracts · compiled September 10, 2026 · how each grade works and its sources

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