Cascade County, MT

ZIP 59404

In ZIP 59404, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: Gore Hill County Water Dist has 1 contaminant at or over an EPA legal limit; 10 contaminants are above health goals, led by lead at 34× California’s Public Health Goal.
• Nearest Superfund site: Acm Smelter and Refinery, 7.1 miles away.
• Largest share of modeled toxic air from industry: Calumet Montana Refining LLC. (100%), mostly benzene.
• Fine particles (PM2.5) average 6.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 388,509 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 59404

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

Based on 9 census tracts · compiled September 10, 2026 · how each grade works and its sources

Loading the full report, with every source…