Los Angeles County, CA

ZIP 91321

In ZIP 91321, 10 of the 12 things we check have at least one part graded D or F.

• Drinking water: San Antonio Canyon Msc has 1 contaminant at or over an EPA legal limit; 4 contaminants are above health goals, led by di(2-ethylhexyl) phthalate at 325× California’s Public Health Goal.
• Nearest Superfund site: Jet Propulsion Laboratory (nasa), 9.3 miles away.
• Largest share of modeled toxic air from industry: Lockheed Martin Aeronautics Co (70%), mostly chromium.
• Fine particles (PM2.5) average 8.7 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 91321

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

Based on 14 census tracts · compiled September 10, 2026 · how each grade works and its sources

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