Casselton Lagoon Wastewater Treatment Plant, Casselton, North Dakota

Casselton Lagoon is a municipal wastewater treatment facility located in Casselton, North Dakota, serving a population of about 2,329 residents. The plant operates as a lagoon system providing secondary treatment, which is typical for small communities in the region. The plant has a designed capacity of 946,350 gallons per day and currently treats an average daily flow of 870,650 gallons, indicating it operates below its full capacity. As a US facility, it is regulated under the Clean Water Act and likely holds an NPDES permit issued by the North Dakota Department of Environmental Quality, which sets effluent limits to protect water quality. The treated effluent is discharged into local waterways that eventually drain into the Red River of the North, which flows north into Lake Winnipeg in Canada. This watershed is part of the larger Hudson Bay drainage basin. The plant's operations help protect downstream aquatic ecosystems and maintain water quality in the Red River Valley.

The plant discharges into the Red River of the North basin, which ultimately drains into Lake Winnipeg and Hudson Bay. The Red River Valley is a flat, agricultural region where nutrient loading from wastewater can contribute to algal blooms in Lake Winnipeg. Secondary treatment reduces organic pollutants and helps mitigate eutrophication risks in downstream waters.