Polk County, WI

ZIP 54020

In ZIP 54020, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Somerset Waterworks has 1 contaminant at or over an EPA legal limit; 10 contaminants are above health goals, led by cyanide at 660× California’s Public Health Goal.
• Nearest Superfund site: Baytown Township Ground Water Plume, 10.0 miles away.
• Largest share of modeled toxic air from industry: Andersen Corp (35%), mostly cobalt compounds.
• Fine particles (PM2.5) average 7.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 135,744 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 54020

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

Based on 5 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…