Los Angeles County, CA
ZIP 91773
In ZIP 91773, 10 of the 12 things we check have at least one part graded D or F.
- Drinking water: Suburban Water Systems-Covina Knolls meets every EPA legal limit; 8 contaminants are above health goals, led by lead at 75× California’s Public Health Goal.
- Nearest Superfund site: San Gabriel Valley (area 2), 7.3 miles away (2 within 10 miles).
- Largest share of modeled toxic air from industry: Sterigenics-Ontario Facility (41%), mostly ethylene oxide.
- Fine particles (PM2.5) average 12.2 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
- About 250,208 kg of agricultural pesticides are applied in the county each year.
Grades for ZIP 91773
- Superfund sites nearbyA to D
- Factories and industrial sitesD
- Oil and gas wellsA to F
- Parks and nature nearbyC to F
- Air qualityF
- Drinking water qualityD to F
- Pesticide useB to D
- Neighborhood health statusA to C
- Past wildfire impactsC to F
- Past flood impactsA to C
- Noise levelsA to D
- Radiation signalsC to D
Based on 15 census tracts · compiled September 10, 2026 · how each grade works and its sources
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