Los Angeles County, CA

ZIP 91745

In ZIP 91745, 10 of the 12 things we check have at least one part graded D or F.

• Drinking water: La Habra Heights Cwd has 2 contaminants at or over an EPA legal limit; 16 contaminants are above health goals, led by lead at 50× California’s Public Health Goal.
• Nearest Superfund site: San Gabriel Valley (area 4), 0.8 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Sterigenics-Ontario Facility (22%), mostly ethylene oxide.
• Fine particles (PM2.5) average 13.4 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 91745

• Superfund sites nearbyF
• Factories and industrial sitesF
• Oil and gas wellsF
• Parks and nature nearbyB to D
• Air qualityF
• Drinking water qualityD to F
• Pesticide useB to D
• Neighborhood health statusA to C
• Past wildfire impactsA to D
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsD

Based on 16 census tracts · compiled September 10, 2026 · how each grade works and its sources

Loading the full report, with every source…