Sangamon County, IL

ZIP 62684

In ZIP 62684, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Williamsville meets every EPA legal limit; 7 contaminants are above health goals, led by bromodichloromethane at 128× California’s Public Health Goal.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Gsi Group (44%), mostly chromium.
• Fine particles (PM2.5) average 7.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 498,036 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 62684

• Superfund sites nearbyA
• Factories and industrial sitesA to B
• Oil and gas wellsA to F
• Parks and nature nearbyC
• Air qualityC
• Drinking water qualityC
• Pesticide useF
• Neighborhood health statusB to C
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to B
• Radiation signalsF

Based on 3 census tracts · compiled October 25, 2026 · how each grade works and its sources

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