Maricopa County, AZ

ZIP 85303

In ZIP 85303, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Peoria City Of meets every EPA legal limit; 9 contaminants are above health goals, led by arsenic at 1,359× California’s Public Health Goal.
• Nearest Superfund site: Luke Air Force Base, 9.2 miles away.
• Largest share of modeled toxic air from industry: Cornellcookson (88%), mostly chromium.
• Fine particles (PM2.5) average 8.9 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 1,094,686 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 85303

• Superfund sites nearbyA
• Factories and industrial sitesC to F
• Oil and gas wellsB
• Parks and nature nearbyC to D
• Air qualityF
• Drinking water qualityC to D
• Pesticide useC to D
• Neighborhood health statusB to C
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsD

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

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