Stillwater County, MT

ZIP 59019

In ZIP 59019, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Rio Vista Estates Hoa Assoc Inc meets every EPA legal limit; 9 contaminants are above health goals, led by arsenic at 250× California’s Public Health Goal.
• Nearest Superfund site: Mouat Industries, 5.4 miles away.
• Largest share of modeled toxic air from industry: Smc Precious Metals Smelter & Base Metals Refinery (48%), mostly nickel compounds.
• Fine particles (PM2.5) average 5.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 53,637 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 59019

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

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

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