Maricopa County, AZ

ZIP 85234

In ZIP 85234, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Mesa City Of has 1 contaminant at or over an EPA legal limit; 8 contaminants are above health goals, led by lithium at 14× the USGS health-based screening level.
• Nearest Superfund site: Williams Air Force Base, 4.7 miles away.
• Largest share of modeled toxic air from industry: Kloeckner Metals Corp (95%), mostly chromium.
• Fine particles (PM2.5) average 9.0 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 85234

• Superfund sites nearbyD
• Factories and industrial sitesB to C
• Oil and gas wellsA to B
• Parks and nature nearbyC to D
• Air qualityF
• Drinking water qualityC to D
• Pesticide useC to F
• Neighborhood health statusA to B
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsD

Based on 16 census tracts · compiled October 25, 2026 · how each grade works and its sources

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