San Bernardino County, CA

ZIP 91708

In ZIP 91708, 6 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 (83%), mostly ethylene oxide.
• Fine particles (PM2.5) average 12.7 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 91708

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

Based on 3 census tracts · compiled October 25, 2026 · how each grade works and its sources

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