Winnebago County, WI

ZIP 54956

In ZIP 54956, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Greenville Utilities Vil Of has 2 contaminants at or over an EPA legal limit; 10 contaminants are above health goals, led by arsenic at 117,583× California’s Public Health Goal.
• Nearest Superfund site: Schmalz Dump, 6.4 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: A P Nonweiler Co Inc (64%), mostly diisocyanates.
• Fine particles (PM2.5) average 7.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 82,862 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 54956

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

Based on 13 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…