San Bernardino County, CA

ZIP 91709

In ZIP 91709, 7 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.
• Closer to Superfund sites than 59% 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 (83%), 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 91709

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

Based on 16 census tracts · compiled October 25, 2026 · how each grade works and its sources

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