San Bernardino County, CA
ZIP 91710
In ZIP 91710, 9 of the 12 things we check have at least one part graded D or F.
- Drinking water: Chino Hills, City Of has 1 contaminant at or over an EPA legal limit; 14 contaminants are above health goals, led by arsenic at 2,764× California’s Public Health Goal.
- Nearest Superfund site: Stringfellow, 8.6 miles away.
- Largest share of modeled toxic air from industry: Sterigenics-Ontario Facility (77%), mostly ethylene oxide.
- Fine particles (PM2.5) average 10.9 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
- About 52,223 kg of agricultural pesticides are applied in the county each year.
Grades for ZIP 91710
- Superfund sites nearbyA to C
- Factories and industrial sitesC to F
- Oil and gas wellsC to F
- Parks and nature nearbyB to D
- Air qualityF
- Drinking water qualityC to F
- Pesticide useA to C
- Neighborhood health statusA to F
- Past wildfire impactsD to F
- Past flood impactsC
- Noise levelsA to D
- Radiation signalsC to D
Based on 22 census tracts · compiled October 25, 2026 · how each grade works and its sources
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