Miles City WWTP - Municipal Wastewater Treatment in Miles City, Montana

Miles City WWTP is a municipal wastewater treatment facility located in Miles City, Montana, serving a population of about 9,941 people. The plant is situated in the Yellowstone River watershed, a major tributary of the Missouri River system. As a medium-sized agglomeration, the facility plays a key role in managing wastewater for this eastern Montana community. The plant operates under the U.S. Clean Water Act framework, which requires secondary treatment for municipal wastewater plants. Facilities of this scale in Montana typically employ biological treatment processes such as activated sludge or lagoons to meet state and federal effluent standards. The plant's discharge is regulated through an EPA-authorized National Pollutant Discharge Elimination System (NPDES) permit issued by the Montana Department of Environmental Quality. The treated effluent from Miles City WWTP is discharged into the Yellowstone River, which flows north and east to join the Missouri River near the North Dakota border. The Yellowstone River supports diverse aquatic life, including native fish species such as pallid sturgeon and sauger, and provides critical habitat for migratory birds. Downstream, the Missouri River system eventually drains into the Mississippi River and the Gulf of Mexico, making the plant's performance important for regional water quality.

The plant discharges into the Yellowstone River, a major tributary of the Missouri River system. The Yellowstone River basin supports diverse aquatic ecosystems, including cold-water fisheries and riparian habitats. Downstream, the Missouri River flows into the Mississippi River and ultimately the Gulf of Mexico, making nutrient and pollutant management at this plant important for regional water quality. The area is semi-arid with seasonal flow variations, and the river provides irrigation and recreation for local communities.