Orange County, CA

ZIP 92780

In ZIP 92780, 8 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; 16 contaminants are above health goals, led by pfoa at 829× California’s Public Health Goal.
• Nearest Superfund site: El Toro Marine Corps Air Station, 7.1 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Certified Alloy Products Inc (23%), mostly ethylene oxide.
• Fine particles (PM2.5) average 10.6 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 92780

• Superfund sites nearbyA to D
• Factories and industrial sitesF
• Oil and gas wellsA to C
• Parks and nature nearbyB to D
• Air qualityF
• Drinking water qualityC to F
• Pesticide useB to C
• Neighborhood health statusA to B
• Past wildfire impactsD to F
• Past flood impactsA
• Noise levelsB to F
• Radiation signalsB to D

Based on 17 census tracts · compiled October 25, 2026 · how each grade works and its sources

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