Mineral County, MT

ZIP 59820

In ZIP 59820, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Meadow Brook Park meets every EPA legal limit; 3 contaminants are above health goals, led by lead at 10× California’s Public Health Goal.
• Closer to Superfund sites than 97% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Hexion Inc. (53%), mostly formaldehyde.
• Fine particles (PM2.5) average 6.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 1,654 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 59820

• Superfund sites nearbyD to F
• Factories and industrial sitesA to B
• Oil and gas wellsA
• Parks and nature nearbyB
• Air qualityA
• Drinking water qualityC to D
• Pesticide useC to F
• Neighborhood health statusC to D
• Past wildfire impactsC to F
• Past flood impactsA
• Noise levelsA
• Radiation signalsD

Based on 3 census tracts · compiled September 10, 2026 · how each grade works and its sources

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