San Diego County, CA

ZIP 92021

In ZIP 92021, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: San Diego County Water Authority has 2 contaminants at or over an EPA legal limit; 13 contaminants are above health goals, led by pfos at 6× 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: Gkn Aerospace Chem-Tronics Inc (46%), mostly chromium compounds.
• Fine particles (PM2.5) average 9.0 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 92021

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

Based on 21 census tracts · compiled September 10, 2026 · how each grade works and its sources

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