San Bernardino County, CA

ZIP 92401

In ZIP 92401, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: San Bernardino City meets every EPA legal limit; 14 contaminants are above health goals, led by pfos at 1.2× California’s Public Health Goal.
• Nearest Superfund site: Norton Air Force Base (lndfll #2), 2.6 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Sterigenics-Ontario Facility (84%), mostly ethylene oxide.
• Fine particles (PM2.5) average 11.8 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 92401

• Superfund sites nearbyF
• Factories and industrial sitesD
• Oil and gas wellsC
• Parks and nature nearbyB to C
• Air qualityF
• Drinking water qualityB to C
• Pesticide useA
• Neighborhood health statusD to F
• Past wildfire impactsD to F
• Past flood impactsC
• Noise levelsA to D
• Radiation signalsF

Based on 4 census tracts · compiled October 25, 2026 · how each grade works and its sources

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