Los Angeles County, CA
ZIP 91311
In ZIP 91311, 9 of the 12 things we check have at least one part graded D or F.
- Drinking water: Santa Clarita Valley Water Agency has 2 contaminants at or over an EPA legal limit; 19 contaminants are above health goals, led by lithium at 2.3× the USGS health-based screening level.
- Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
- Largest share of modeled toxic air from industry: Torrance Refining Co LLC (31%), mostly ethylene oxide.
- Fine particles (PM2.5) average 8.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
- About 2,496,015 kg of agricultural pesticides are applied in the county each year.
Grades for ZIP 91311
- Superfund sites nearbyA
- Factories and industrial sitesC to F
- Oil and gas wellsC to F
- Parks and nature nearbyA to D
- Air qualityC to F
- Drinking water qualityC to F
- Pesticide useB to F
- Neighborhood health statusA to C
- Past wildfire impactsF
- Past flood impactsA
- Noise levelsA to D
- Radiation signalsB to F
Based on 21 census tracts · compiled October 25, 2026 · how each grade works and its sources
Loading the full report, with every source…