Orange County, CA

ZIP 90743

In ZIP 90743, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of Westminster has 1 contaminant at or over an EPA legal limit; 17 contaminants are above health goals, led by pfos at 4.5× California’s Public Health Goal.
• Nearest Superfund site: Ralph Gray Trucking Co., 3.9 miles away.
• Largest share of modeled toxic air from industry: Certified Alloy Products Inc (44%), mostly cobalt.
• Fine particles (PM2.5) average 9.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 206,209 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 90743

• Superfund sites nearbyA to C
• Factories and industrial sitesF
• Oil and gas wellsF
• Parks and nature nearbyC to D
• Air qualityF
• Drinking water qualityD to F
• Pesticide useC to D
• Neighborhood health statusA to B
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to C

Based on 2 census tracts · compiled September 10, 2026 · how each grade works and its sources

Loading the full report, with every source…