Los Angeles County, CA

ZIP 91381

In ZIP 91381, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Santa Clarita Valley W.a.-Castaic Div. meets every EPA legal limit; 11 contaminants are above health goals, led by lead at 71× California’s Public Health Goal.
• 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: Lockheed Martin Aeronautics Co (50%), mostly chromium.
• Fine particles (PM2.5) average 7.8 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 91381

• Superfund sites nearbyA
• Factories and industrial sitesC
• Oil and gas wellsF
• Parks and nature nearbyB to C
• Air qualityB to C
• Drinking water qualityF
• Pesticide useC to D
• Neighborhood health statusA to B
• Past wildfire impactsF
• Past flood impactsA
• Noise levelsA
• Radiation signalsD

Based on 3 census tracts · compiled September 10, 2026 · how each grade works and its sources

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