Washington County, WI

ZIP 53027

In ZIP 53027, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Hartford Waterworks meets every EPA legal limit; 14 contaminants are above health goals, led by pfos at 3.8× California’s Public Health Goal.
• Nearest Superfund site: Oconomowoc Electroplating Co., Inc., 4.6 miles away.
• Largest share of modeled toxic air from industry: Milwaukee Precision Casting (21%), mostly chromium.
• Fine particles (PM2.5) average 6.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 77,662 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 53027

• Superfund sites nearbyA to F
• Factories and industrial sitesB to C
• Oil and gas wellsA
• Parks and nature nearbyC to D
• Air qualityA to B
• 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 signalsD

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

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