Orange County, CA

ZIP 92861

In ZIP 92861, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: Serrano Water District has 2 contaminants at or over an EPA legal limit; 14 contaminants are above health goals, led by lead at 429× California’s Public Health Goal.
• Nearest Superfund site: Orange County North Basin, 7.0 miles away.
• Largest share of modeled toxic air from industry: Sterigenics-Ontario Facility (22%), mostly chromium.
• Fine particles (PM2.5) average 10.9 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 92861

• Superfund sites nearbyD
• Factories and industrial sitesD to F
• Oil and gas wellsF
• Parks and nature nearbyD to F
• Air qualityF
• Drinking water qualityF
• Pesticide useC
• Neighborhood health statusB to C
• Past wildfire impactsF
• Past flood impactsC
• Noise levelsA to B
• Radiation signalsD

Based on 5 census tracts · compiled September 10, 2026 · how each grade works and its sources

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