Orange County, CA

ZIP 92703

In ZIP 92703, 9 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., 5.5 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Certified Alloy Products Inc (45%), mostly cobalt.
• Fine particles (PM2.5) average 11.9 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 92703

• Superfund sites nearbyA to D
• Factories and industrial sitesD to F
• Oil and gas wellsB to F
• Parks and nature nearbyD to F
• Air qualityF
• Drinking water qualityD to F
• Pesticide useC to D
• Neighborhood health statusB to C
• Past wildfire impactsC to D
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsC

Based on 21 census tracts · compiled September 10, 2026 · how each grade works and its sources

Loading the full report, with every source…