Langdon Lagoon Wastewater Treatment Plant, Langdon, North Dakota

Langdon Lagoon is a municipal wastewater treatment facility located in Langdon, North Dakota, serving a population of approximately 1,878 residents. The plant is situated in Cavalier County, near the Canadian border, and operates as a lagoon system providing secondary treatment. The plant treats an average daily wastewater volume of 870.65 cubic meters against a designed capacity of 1665.58 cubic meters. As a secondary treatment facility, it meets the standard requirements under the U.S. Clean Water Act for municipal wastewater treatment, which mandates secondary treatment for most publicly owned treatment works. The treated effluent from Langdon Lagoon is discharged into local waterways that ultimately drain into the Hudson Bay watershed via the Souris River system. The plant plays a key role in protecting water quality in this rural agricultural region, where surface waters support irrigation, livestock, and aquatic habitats.

Langdon Lagoon discharges into the Souris River basin, which flows north into Canada and eventually reaches Hudson Bay. The surrounding area is predominantly agricultural, with the plant helping to prevent nutrient and pathogen pollution in local streams and groundwater. The watershed supports diverse aquatic life and is important for migratory waterfowl in the Prairie Pothole Region.