Riverside County, CA

ZIP 92320

In ZIP 92320, 3 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; 13 contaminants are above health goals, led by pfos at 1.4× 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
• Oil and gas wellsA to C
• Parks and nature nearbyA to C
• Air qualityC
• Drinking water qualityA to C
• Pesticide useA to C
• 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 October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…