San Diego County, CA

ZIP 92104

In ZIP 92104, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: San Diego, City Of has 2 contaminants at or over an EPA legal limit; 28 contaminants are above health goals, led by lead at 31× 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: General Dynamics (Nassco) (38%), mostly ethylbenzene.
• Fine particles (PM2.5) average 9.2 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 92104

• Superfund sites nearbyA
• Factories and industrial sitesC
• Oil and gas wellsC to F
• Parks and nature nearbyD to F
• Air qualityF
• Drinking water qualityF
• Pesticide useC to D
• Neighborhood health statusA to B
• Past wildfire impactsC to D
• Past flood impactsF
• Noise levelsB to D
• Radiation signalsC

Based on 20 census tracts · compiled September 10, 2026 · how each grade works and its sources

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