Los Angeles County, CA
ZIP 91103
In ZIP 91103, 8 of the 12 things we check have at least one part graded D or F.
- Drinking water: Liberty Utilities - Mesa Crest meets every EPA legal limit; 7 contaminants are above health goals, led by lead at 136× California’s Public Health Goal.
- Nearest Superfund site: Jet Propulsion Laboratory (nasa), 2.9 miles away (3 within 10 miles).
- Largest share of modeled toxic air from industry: Certified Alloy Products Inc (27%), mostly ethylene oxide.
- Fine particles (PM2.5) average 11.1 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 91103
- Superfund sites nearbyF
- Factories and industrial sitesC
- Oil and gas wellsA to C
- Parks and nature nearbyC to F
- Air qualityD to F
- Drinking water qualityC to F
- Pesticide useB to D
- Neighborhood health statusB to D
- Past wildfire impactsD to F
- Past flood impactsA
- Noise levelsA to D
Based on 10 census tracts · compiled September 10, 2026 · how each grade works and its sources
Loading the full report, with every source…