Yellowstone County, MT

ZIP 59101

In ZIP 59101, 6 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 arsenic at 167× California’s Public Health Goal.
• Nearest Superfund site: Billings PCE, 1.9 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Phillips 66 Co Billings Refinery (74%), mostly 1,3-butadiene.
• Fine particles (PM2.5) average 6.7 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 59101

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

Based on 17 census tracts · compiled October 25, 2026 · how each grade works and its sources

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