Riverside County, CA

ZIP 92879

In ZIP 92879, 10 of the 12 things we check have at least one part graded D or F.

• Drinking water: Riverside, City Of has 2 contaminants at or over an EPA legal limit; 18 contaminants are above health goals, led by pfhxs at 1.8× California Notification Level.
• Nearest Superfund site: Stringfellow, 7.8 miles away.
• Largest share of modeled toxic air from industry: Sterigenics-Ontario Facility (70%), mostly ethylene oxide.
• Fine particles (PM2.5) average 12.5 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 92879

• Superfund sites nearbyA to D
• Factories and industrial sitesC to D
• Oil and gas wellsC to F
• Parks and nature nearbyB to D
• Air qualityF
• Drinking water qualityC to F
• Pesticide useC to F
• Neighborhood health statusA to C
• Past wildfire impactsA to D
• Past flood impactsC
• Noise levelsA to D
• Radiation signalsB to D

Based on 17 census tracts · compiled October 25, 2026 · how each grade works and its sources

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