San Bernardino County, CA
ZIP 92374
In ZIP 92374, 8 of the 12 things we check have at least one part graded D or F.
- Drinking water: Loma Linda, City Of has 1 contaminant at or over an EPA legal limit; 14 contaminants are above health goals, led by arsenic at 1,806× California’s Public Health Goal.
- Nearest Superfund site: Norton Air Force Base (lndfll #2), 3.3 miles away (2 within 10 miles).
- Largest share of modeled toxic air from industry: Sterigenics-Ontario Facility (53%), mostly ethylene oxide.
- Fine particles (PM2.5) average 9.5 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 92374
- Superfund sites nearbyC to F
- Factories and industrial sitesB to D
- Oil and gas wellsA to C
- Parks and nature nearbyA to C
- Air qualityD to F
- Drinking water qualityB to D
- Pesticide useA to C
- Neighborhood health statusA to D
- Past wildfire impactsC to F
- Past flood impactsC
- Noise levelsA to D
- Radiation signalsC to F
Based on 13 census tracts · compiled October 25, 2026 · how each grade works and its sources
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