Clinton County, IL

ZIP 62231

In ZIP 62231, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: Hoyleton Rwc meets every EPA legal limit; 7 contaminants are above health goals, led by bromodichloromethane at 137× California’s Public Health Goal.
• Nearest Superfund site: Circle Smelting Corp., 3.8 miles away.
• Largest share of modeled toxic air from industry: Wood River Refinery (62%), mostly chromium compounds.
• Fine particles (PM2.5) average 7.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 292,061 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 62231

• Superfund sites nearbyC to F
• Factories and industrial sitesA to D
• Oil and gas wellsF
• Parks and nature nearbyC to F
• Air qualityC
• Drinking water qualityB to C
• Pesticide useF
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsD

Based on 6 census tracts · compiled October 25, 2026 · how each grade works and its sources

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