Columbia Falls WWTP | Wastewater Treatment in Columbia Falls, Montana

Columbia Falls WWTP is a municipal wastewater treatment facility located in Columbia Falls, Montana, serving a population of about 3,423. The plant is situated in Flathead County, near the Flathead River, a major tributary of the Columbia River system. As a US facility, the plant operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Montana Department of Environmental Quality. For a community of this size, secondary treatment is typically required to meet federal standards for organic matter and suspended solids removal. The plant's treated effluent is discharged into the Flathead River watershed, which flows into Flathead Lake and eventually the Columbia River. This region is ecologically sensitive, supporting diverse aquatic life including native trout species and providing critical habitat for migratory birds.

The plant discharges into the Flathead River basin, which drains into Flathead Lake, one of the largest natural freshwater lakes in the western US. The watershed supports a diverse ecosystem including bull trout and westslope cutthroat trout. Downstream, the Flathead River joins the Clark Fork River and ultimately the Columbia River, which flows to the Pacific Ocean. Protecting water quality in this system is vital for regional biodiversity and recreational uses.