Sheldon Lagoon Wastewater Treatment Plant, Sheldon, North Dakota

Sheldon Lagoon is a municipal wastewater treatment facility located in Sheldon, North Dakota, serving a small population of 116 residents. The plant operates as a lagoon system providing secondary treatment, which is typical for small communities in the rural Great Plains region. As a secondary treatment facility, Sheldon Lagoon meets the US Clean Water Act requirements for biological treatment of organic matter. The plant has a designed capacity of 75.71 megaliters per year and currently treats an average daily flow of 37.85 megaliters per year, operating well within its capacity. Lagoons are common in this region due to low population density and available land area. The treated effluent from Sheldon Lagoon discharges into local surface waters that eventually drain into the Sheyenne River, a tributary of the Red River of the North. This river system flows north into Lake Winnipeg in Canada, making the plant's discharge part of a larger transboundary watershed. Proper treatment helps protect downstream aquatic ecosystems and water quality.

Sheldon Lagoon's treated effluent enters local streams that flow into the Sheyenne River, which joins the Red River of the North and ultimately drains into Lake Winnipeg in Manitoba, Canada. This watershed supports diverse aquatic life and is important for migratory birds. The plant's secondary treatment helps reduce nutrient loading and organic pollutants, protecting downstream water quality in this ecologically sensitive prairie river system.