Mason County, MI

ZIP 49431

In ZIP 49431, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Ludington meets every EPA legal limit; 5 contaminants are above health goals, led by pfos at 2.4× California’s Public Health Goal.
• Closer to Superfund sites than 55% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Great Lakes Castings LLC (81%), mostly lead.
• Fine particles (PM2.5) average 5.6 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 137,842 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 49431

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

Based on 6 census tracts · compiled September 10, 2026 · how each grade works and its sources

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