Monroe County, WI

ZIP 54638

In ZIP 54638, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Wilton Waterworks meets every EPA legal limit; 7 contaminants are above health goals, led by lead at 344× California’s Public Health Goal.
• Nearest Superfund site: Tomah Fairgrounds, 9.6 miles away.
• Largest share of modeled toxic air from industry: Sprinkman Manufacturing (40%), mostly chromium.
• Fine particles (PM2.5) average 6.8 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 54638

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

Based on 4 census tracts · compiled September 10, 2026 · how each grade works and its sources

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