Riverside County, CA

ZIP 92555

In ZIP 92555, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Riverside Highland Water Company has 2 contaminants at or over an EPA legal limit; 13 contaminants are above health goals, led by pfoa at 914× California’s Public Health Goal.
• Nearest Superfund site: March Air Force Base, 4.3 miles away.
• Largest share of modeled toxic air from industry: Sterigenics-Ontario Facility (43%), mostly ethylene oxide.
• Fine particles (PM2.5) average 9.4 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 92555

• Superfund sites nearbyA to D
• Factories and industrial sitesB to D
• Oil and gas wellsA to C
• Parks and nature nearbyA to C
• Air qualityB to F
• Drinking water qualityA to F
• Pesticide useC to F
• Neighborhood health statusA to C
• Past wildfire impactsC to F
• Past flood impactsC
• Noise levelsA to B
• Radiation signalsB to D

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

Loading the full report, with every source…