Marathon County, WI

ZIP 54455

In ZIP 54455, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Mosinee East System has 2 contaminants at or over an EPA legal limit; 9 contaminants are above health goals, led by pfos at 21× California’s Public Health Goal.
• Closer to Superfund sites than 61% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Imperial Industries Inc (58%), mostly chromium compounds.
• Fine particles (PM2.5) average 6.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 836,979 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 54455

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

Based on 6 census tracts · compiled September 10, 2026 · how each grade works and its sources

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