La Crosse County, WI

ZIP 54603

In ZIP 54603, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Island Estates meets every EPA legal limit; 4 contaminants are above health goals, led by pfos at 2.2× California’s Public Health Goal.
• Nearest Superfund site: Onalaska Municipal Landfill, 7.1 miles away.
• Largest share of modeled toxic air from industry: Torrance Casting Inc (33%), mostly nickel.
• Fine particles (PM2.5) average 7.6 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 52,690 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 54603

• Superfund sites nearbyA to C
• Factories and industrial sitesD to F
• Oil and gas wellsA
• Parks and nature nearbyB
• Air qualityC
• Drinking water qualityC
• Pesticide useC to F
• Neighborhood health statusC to F
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsC to D
• Radiation signalsB

Based on 4 census tracts · compiled October 25, 2026 · how each grade works and its sources

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