Superior WWTP - Secondary Wastewater Treatment in Superior, Montana

Superior WWTP is a municipal wastewater treatment facility located in Superior, Montana, serving a population of 881. The plant provides secondary treatment, a standard level for small communities in the United States, ensuring compliance with Clean Water Act requirements. The plant has a designed capacity of 681.37 million gallons and treats an annual discharge volume of 283.91 million gallons. As a US facility, it operates under the National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect water quality. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into a local water body, likely a tributary of the Clark Fork River, which flows into the Pend Oreille River and eventually reaches the Columbia River and the Pacific Ocean. The plant plays a key role in protecting the Clark Fork watershed, which supports diverse aquatic life and is important for regional ecology.

The plant discharges into a water body within the Clark Fork River basin, which drains into the Pend Oreille River and ultimately the Columbia River and Pacific Ocean. The Clark Fork watershed is ecologically significant, supporting native fish species such as bull trout and westslope cutthroat trout. The plant's secondary treatment helps maintain water quality in this sensitive river system.