Rothsay WWTP - Secondary Wastewater Treatment in Rothsay, Minnesota

Rothsay WWTP is a municipal wastewater treatment plant located in Rothsay, Wilkin County, Minnesota, serving a population of 742. The facility provides secondary treatment, which is the standard level required by the US Clean Water Act for communities of this size to protect water quality. The plant has a designed capacity of 211.98 million gallons per year and discharges a similar volume, indicating full utilization. As a small agglomeration, it operates under the National Pollutant Discharge Elimination System (NPDES) permit program, administered by the Minnesota Pollution Control Agency, which sets effluent limits to safeguard receiving waters. The treated effluent is discharged into a local water body that ultimately drains into the Red River of the North, which flows north into Lake Winnipeg in Canada. This watershed supports diverse aquatic life and is part of the larger Hudson Bay drainage basin. The plant's secondary treatment helps reduce nutrient and organic pollutant loads, protecting downstream ecosystems.

The plant discharges into a tributary of the Red River of the North, which flows through the Red River Valley into Lake Winnipeg. This watershed is ecologically sensitive due to nutrient loading concerns, and secondary treatment helps mitigate impacts on downstream aquatic habitats and migratory bird corridors.