Pinal County, AZ

ZIP 85140

In ZIP 85140, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Epcor - San Tan has 1 contaminant at or over an EPA legal limit; 13 contaminants are above health goals, led by lead at 23× California’s Public Health Goal.
• Nearest Superfund site: Williams Air Force Base, 7.8 miles away.
• Largest share of modeled toxic air from industry: Zf Passive Safety Systems Inc - Mesa Operations (51%), mostly chromium compounds.
• Fine particles (PM2.5) average 8.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 812,658 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 85140

• Superfund sites nearbyA to D
• Factories and industrial sitesA to C
• Oil and gas wellsA to C
• Parks and nature nearbyB to F
• Air qualityB to D
• Drinking water qualityD to F
• Pesticide useD to F
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsD

Based on 8 census tracts · compiled September 10, 2026 · how each grade works and its sources

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