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: Heritage Hills Mobile Home Village has 1 contaminant at or over an EPA legal limit; 2 contaminants are above health goals, led by pfoa at 714× 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 (53%), 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 F
• Oil and gas wellsD
• Parks and nature nearbyB to C
• Air qualityA
• Drinking water qualityA to D
• Pesticide useD to F
• Neighborhood health statusF
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsA

Based on 6 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…