Riverside County, CA

ZIP 92320

In ZIP 92320, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Yucaipa Valley Water District meets every EPA legal limit; 16 contaminants are above health goals, led by lead at 162× 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: Sterigenics-Ontario Facility (53%), mostly ethylene oxide.
• Fine particles (PM2.5) average 7.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 1,172,577 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 92320

• Superfund sites nearbyA
• Factories and industrial sitesB to C
• Oil and gas wellsA to C
• Parks and nature nearbyC to D
• Air qualityC
• Drinking water qualityC to F
• Pesticide useB to D
• Neighborhood health statusA to D
• Past wildfire impactsD
• Past flood impactsC
• Noise levelsA to C
• Radiation signalsC to D

Based on 4 census tracts · compiled September 10, 2026 · how each grade works and its sources

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