Yellowstone County, MT

ZIP 59105

In ZIP 59105, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Shepherd Water Station meets every EPA legal limit; 9 contaminants are above health goals, led by arsenic at 292× California’s Public Health Goal.
• Nearest Superfund site: Lockwood Solvent Ground Water Plume, 1.9 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Exxonmobil Billings Refinery (47%), 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 59105

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

Based on 8 census tracts · compiled October 25, 2026 · how each grade works and its sources

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