Yellowstone County, MT

ZIP 59015

In ZIP 59015, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Roundup Water Department meets every EPA legal limit; 10 contaminants are above health goals, led by lead at 35× 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 59015

• Superfund sites nearbyA to D
• Factories and industrial sitesA to C
• Oil and gas wellsA to D
• 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

Loading the full report, with every source…