FOSSTON WWTP - Secondary Wastewater Treatment in Mahnomen County, Minnesota

FOSSTON WWTP is a municipal wastewater treatment facility located in Mahnomen County, Minnesota, serving a population of approximately 1,547 residents. The plant is situated in a rural area of northwestern Minnesota, within the Red River Valley region. As a secondary treatment plant, it provides biological treatment to remove organic matter and suspended solids from wastewater before discharge. The plant has a designed capacity of 1,131.83 million gallons per day and currently treats an average daily flow of 976.64 million gallons, operating below its design capacity. Under the U.S. Clean Water Act, secondary treatment is the minimum standard for municipal wastewater plants, ensuring compliance with National Pollutant Discharge Elimination System (NPDES) permit requirements. The facility is regulated by the Minnesota Pollution Control Agency, which oversees discharge permits and water quality standards. The treated effluent is discharged into local streams that flow into the Red River of the North, which ultimately drains into Lake Winnipeg in Canada. This watershed supports diverse aquatic life and is an important migratory corridor for waterfowl. The plant's operation helps protect downstream water quality in the Red River Basin, which is ecologically sensitive due to its flat terrain and agricultural runoff.

The plant discharges into tributaries of the Red River of the North, which flows northward into Lake Winnipeg. This watershed is characterized by flat topography and extensive agriculture, making it susceptible to nutrient loading. The Red River Basin supports a variety of fish species and provides critical habitat for migratory birds. Protecting water quality in this system is essential for maintaining ecological balance and supporting downstream communities.