Missoula County, MT

ZIP 59804

In ZIP 59804, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Meadow Brook Park meets every EPA legal limit; 3 contaminants are above health goals, led by arsenic at 500× California’s Public Health Goal.
• Nearest Superfund site: Smurfit-Stone Mill Frenchtown, 2.9 miles away.
• Largest share of modeled toxic air from industry: Hexion Inc. (77%), mostly formaldehyde.
• Fine particles (PM2.5) average 7.6 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 10,732 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 59804

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

Based on 7 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…