Marathon County, WI

ZIP 54401

In ZIP 54401, 8 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.
• Nearest Superfund site: Wausau Ground Water Contamination, 2.3 miles away.
• Largest share of modeled toxic air from industry: Veritas Steel (89%), mostly chromium.
• Fine particles (PM2.5) average 7.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 185,897 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 54401

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

Based on 12 census tracts · compiled September 10, 2026 · how each grade works and its sources

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