San Bernardino County, CA

ZIP 91764

In ZIP 91764, 10 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, 6.4 miles away.
• Largest share of modeled toxic air from industry: Sterigenics-Ontario Facility (96%), mostly ethylene oxide.
• Fine particles (PM2.5) average 14.4 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 91764

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

Based on 14 census tracts · compiled September 10, 2026 · how each grade works and its sources

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