Will County, IL

ZIP 60421

In ZIP 60421, 9 of the 12 things we check have at least one part graded D or F.

• Drinking water: Southeast Joliet Sd meets every EPA legal limit; 9 contaminants are above health goals, led by lead at 54× California’s Public Health Goal.
• Nearest Superfund site: Amoco Chemicals (joliet Landfill), 4.5 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Exxonmobil Oil Corp Joliet Refinery (57%), mostly sulfuric acid.
• Fine particles (PM2.5) average 8.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 248,146 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 60421

• Superfund sites nearbyD to F
• Factories and industrial sitesA to F
• Oil and gas wellsA to B
• Parks and nature nearbyC to D
• Air qualityB to D
• Drinking water qualityF
• Pesticide useD to F
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsC to D

Based on 4 census tracts · compiled September 10, 2026 · how each grade works and its sources

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