Los Angeles County, CA

ZIP 91001

In ZIP 91001, 8 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.
• Nearest Superfund site: Jet Propulsion Laboratory (nasa), 3.8 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Certified Alloy Products Inc (23%), mostly ethylene oxide.
• Fine particles (PM2.5) average 10.2 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 91001

• Superfund sites nearbyD to F
• Factories and industrial sitesC to D
• Oil and gas wellsA
• Parks and nature nearbyA to D
• Air qualityB to F
• Drinking water qualityA to F
• Pesticide useB to C
• Neighborhood health statusA to B
• Past wildfire impactsD to F
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsD

Based on 11 census tracts · compiled October 25, 2026 · how each grade works and its sources

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