Walworth County, WI

ZIP 53121

In ZIP 53121, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: East Troy Waterworks has 1 contaminant at or over an EPA legal limit; 11 contaminants are above health goals, led by pfos at 4.5× California’s Public Health Goal.
• Nearest Superfund site: Delavan Municipal Well #4, 1.8 miles away.
• Largest share of modeled toxic air from industry: Arnold Magnetic Technologies - Arnold Engineering (29%), mostly cobalt.
• Fine particles (PM2.5) average 6.6 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 53121

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

Based on 9 census tracts · compiled October 25, 2026 · how each grade works and its sources

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