Thompson Lagoon Wastewater Treatment Plant, Thompson, North Dakota

Thompson Lagoon is a municipal wastewater treatment facility located in Thompson, North Dakota, serving a population of approximately 986 residents. The plant provides secondary treatment, a standard level for small communities in the United States, ensuring compliance with the Clean Water Act. The plant has a designed capacity of 378.54 cubic meters per day and discharges a similar volume, indicating full utilization. As a lagoon-based system, it relies on natural biological processes to treat wastewater before discharge. The facility operates under the National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect water quality. The treated effluent is discharged to local waterways that eventually drain into the Red River of the North, which flows north into Lake Winnipeg in Canada. This watershed supports diverse aquatic life and is an important migratory corridor for waterfowl. The plant's location inland and away from coastal areas reduces direct marine impact.

The plant discharges into the Red River of the North basin, which flows through North Dakota and Minnesota into Manitoba, Canada, ultimately reaching Lake Winnipeg. This watershed supports diverse aquatic species and is a critical habitat for migratory birds. The region's flat terrain and agricultural land use mean that nutrient loading from wastewater can contribute to eutrophication in downstream lakes, making effective secondary treatment important for ecological health.