Williamson County, IL

ZIP 62933

In ZIP 62933, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: Herrin meets every EPA legal limit; 9 contaminants are above health goals, led by lead at 43× California’s Public Health Goal.
• Nearest Superfund site: Sangamo Electric Dump/crab Orchard National Wildlife Refuge (usdoi), 4.5 miles away.
• Largest share of modeled toxic air from industry: Aisin Manufacturing Illinois LLC (59%), mostly manganese.
• Fine particles (PM2.5) average 7.4 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 63,088 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 62933

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

Based on 2 census tracts · compiled September 10, 2026 · how each grade works and its sources

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