San Diego County, CA

ZIP 92078

In ZIP 92078, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Olivenhain Mwd meets every EPA legal limit; 11 contaminants are above health goals, led by arsenic at 598× California’s Public Health Goal.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Watkins Manufacturing (63%), mostly diisocyanates.
• Fine particles (PM2.5) average 9.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 344,328 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 92078

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

Based on 13 census tracts · compiled October 25, 2026 · how each grade works and its sources

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