San Bernardino County, CA
ZIP 91737
In ZIP 91737, 8 of the 12 things we check have at least one part graded D or F.
- Drinking water: Sheep Creek Water Company meets every EPA legal limit; 6 contaminants are above health goals, led by lead at 55× California’s Public Health Goal.
- Closer to Superfund sites than 58% 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 (70%), mostly ethylene oxide.
- Fine particles (PM2.5) average 11.6 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 91737
- Superfund sites nearbyA to C
- Factories and industrial sitesC to D
- Oil and gas wellsA to C
- Parks and nature nearbyB to D
- Air qualityB to F
- Drinking water qualityD to F
- Pesticide useB
- Neighborhood health statusB to D
- Past wildfire impactsD to F
- Past flood impactsC
- Noise levelsA to D
- Radiation signalsC to D
Based on 10 census tracts · compiled September 10, 2026 · how each grade works and its sources
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