San Bernardino County, CA

ZIP 91730

In ZIP 91730, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: Upland, City Of has 1 contaminant at or over an EPA legal limit; 19 contaminants are above health goals, led by pfos at 3.7× California’s Public Health Goal.
• Nearest Superfund site: Stringfellow, 7.6 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Sterigenics-Ontario Facility (78%), mostly ethylene oxide.
• Fine particles (PM2.5) average 13.8 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 91730

• Superfund sites nearbyA to D
• Factories and industrial sitesD to F
• Oil and gas wellsC
• Parks and nature nearbyC to D
• Air qualityF
• Drinking water qualityD to F
• Pesticide useB
• Neighborhood health statusA to C
• Past wildfire impactsD
• Past flood impactsC
• Noise levelsA to D
• Radiation signalsC to D

Based on 16 census tracts · compiled September 10, 2026 · how each grade works and its sources

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