Stillwater County, MT

ZIP 59057

In ZIP 59057, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Skycrest Estates Subdivision meets every EPA legal limit; 10 contaminants are above health goals, led by lead at 31× California’s Public Health Goal.
• Nearest Superfund site: Lockwood Solvent Ground Water Plume, 6.7 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Phillips 66 Co Billings Refinery (54%), mostly 1,3-butadiene.
• Fine particles (PM2.5) average 5.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 144,896 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 59057

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

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

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