Orange County, CA

ZIP 92866

In ZIP 92866, 9 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of Tustin has 2 contaminants at or over an EPA legal limit; 18 contaminants are above health goals, led by lead at 44× California’s Public Health Goal.
• Nearest Superfund site: Orange County North Basin, 6.6 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Commercial Metal Forming (38%), mostly chromium.
• Fine particles (PM2.5) average 12.0 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 92866

• Superfund sites nearbyD
• Factories and industrial sitesD to F
• Oil and gas wellsD to F
• Parks and nature nearbyF
• Air qualityF
• Drinking water qualityF
• Pesticide useC
• Neighborhood health statusB
• Past wildfire impactsD
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsC to D

Based on 4 census tracts · compiled September 10, 2026 · how each grade works and its sources

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