Walworth County, WI

ZIP 53120

In ZIP 53120, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Mukwonago Waterworks has 2 contaminants at or over an EPA legal limit; 13 contaminants are above health goals, led by pfos at 11× California’s Public Health Goal.
• Nearest Superfund site: Muskego Sanitary Landfill, 7.2 miles away.
• Largest share of modeled toxic air from industry: Evonik Corp (40%), mostly ethylene oxide.
• Fine particles (PM2.5) average 6.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 187,205 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 53120

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

Based on 8 census tracts · compiled September 10, 2026 · how each grade works and its sources

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