Orange County, CA

ZIP 92678

In ZIP 92678, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Camp Pendleton (North) has 2 contaminants at or over an EPA legal limit; 19 contaminants are above health goals, led by pfos at 20× California’s Public Health Goal.
• Closer to Superfund sites than 63% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Sterigenics-Ontario Facility (53%), mostly ethylene oxide.
• Fine particles (PM2.5) average 6.8 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 92678

• Superfund sites nearbyD
• Factories and industrial sitesB to C
• Oil and gas wellsA to C
• Parks and nature nearbyB
• Air qualityA to B
• Drinking water qualityC to F
• Pesticide useC to D
• Neighborhood health statusB to C
• Past wildfire impactsF
• Past flood impactsA
• Noise levelsA
• Radiation signalsC to D

Based on 2 census tracts · compiled September 10, 2026 · how each grade works and its sources

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