McHenry County, IL

ZIP 60021

In ZIP 60021, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Cary has 3 contaminants at or over an EPA legal limit; 17 contaminants are above health goals, led by pfos at 2.2× California’s Public Health Goal.
• Nearest Superfund site: Wauconda Sand & Gravel, 4.7 miles away.
• Largest share of modeled toxic air from industry: Electri-Flex (22%), mostly chromium.
• Fine particles (PM2.5) average 7.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 211,541 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 60021

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

Based on 3 census tracts · compiled September 10, 2026 · how each grade works and its sources

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