Los Angeles County, CA

ZIP 91759

In ZIP 91759, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Sheep Creek Water Company meets every EPA legal limit; 6 contaminants are above health goals, led by lead at 55× California’s Public Health Goal.
• Nearest Superfund site: Jet Propulsion Laboratory (nasa), 9.3 miles away.
• Largest share of modeled toxic air from industry: Sterigenics-Ontario Facility (62%), mostly ethylene oxide.
• Fine particles (PM2.5) average 9.2 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 52,223 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 91759

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

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

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