Yellowstone County, MT

ZIP 59105

In ZIP 59105, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: Huntley Yellowstone Co Water And Sewer has 1 contaminant at or over an EPA legal limit; 10 contaminants are above health goals, led by lead at 125× 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 sitesB to D
• Oil and gas wellsA
• Parks and nature nearbyC to F
• Air qualityA
• Drinking water qualityC to F
• Pesticide useD to F
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsD

Based on 8 census tracts · compiled September 10, 2026 · how each grade works and its sources

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