Monroe County, WI

ZIP 54619

In ZIP 54619, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Ontario Waterworks meets every EPA legal limit; 6 contaminants are above health goals, led by arsenic at 108× California’s Public Health Goal.
• Nearest Superfund site: Tomah Fairgrounds, 9.6 miles away.
• Largest share of modeled toxic air from industry: Nelson Global Products Inc.- Viroqua (64%), mostly chromium compounds.
• Fine particles (PM2.5) average 6.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 117,701 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 54619

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

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

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