Treasure County, MT

ZIP 59010

In ZIP 59010, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Hysham Town Of meets every EPA legal limit; 9 contaminants are above health goals, led by arsenic at 1,177× California’s Public Health Goal.
• 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: Colstrip Energy LP Rosebud Power Plant (76%), mostly chromium compounds.
• Fine particles (PM2.5) average 5.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 31,824 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 59010

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

Based on 2 census tracts · compiled October 25, 2026 · how each grade works and its sources

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