Los Angeles County, CA

ZIP 91101

In ZIP 91101, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Pasadena Water And Power meets every EPA legal limit; 21 contaminants are above health goals, led by pfos at 1.2× California’s Public Health Goal.
• Nearest Superfund site: San Gabriel Valley (area 3), 3.5 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Certified Alloy Products Inc (25%), mostly ethylene oxide.
• Fine particles (PM2.5) average 12.3 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 91101

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

Based on 9 census tracts · compiled October 25, 2026 · how each grade works and its sources

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