Ontonagon County, MI

ZIP 49953

In ZIP 49953, 2 of the 12 things we check have at least one part graded D or F.

• Drinking water: Ontonagon meets every EPA legal limit; 3 contaminants are above health goals, led by total haloacetic acids (haa5) at 1.8× Peer-Reviewed Research.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Phelps Cast (100%), mostly zinc (fume or dust).
• Fine particles (PM2.5) average 4.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 1,192 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 49953

• Superfund sites nearbyA
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyB
• Air qualityA
• Drinking water qualityA to B
• Pesticide useC to D
• Neighborhood health statusF
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsB

Based on 3 census tracts · compiled October 25, 2026 · how each grade works and its sources

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