Orange County, CA

ZIP 92870

In ZIP 92870, 10 of the 12 things we check have at least one part graded D or F.

• Drinking water: Yorba Linda Water District has 2 contaminants at or over an EPA legal limit; 13 contaminants are above health goals, led by arsenic at 1,119× California’s Public Health Goal.
• Nearest Superfund site: Orange County North Basin, 3.2 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Sterigenics-Ontario Facility (27%), mostly ethylene oxide.
• Fine particles (PM2.5) average 9.9 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 92870

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

Based on 18 census tracts · compiled October 25, 2026 · how each grade works and its sources

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