Sibley Lagoon Wastewater Treatment Plant, Sibley, North Dakota

Sibley Lagoon is a municipal wastewater treatment facility located in Sibley, North Dakota, United States. The plant serves a small population of 30 residents, reflecting its role in a rural community within Barnes County. As a secondary treatment plant, it meets the standard requirements under the U.S. Clean Water Act for reducing organic pollutants and suspended solids before discharge. The plant has a designed capacity of 15.14 megaliters per year, with a corresponding annual discharge volume of 15.14 megaliters, indicating full utilization of its capacity. Secondary treatment typically involves biological processes such as activated sludge or lagoons. The plant operates under the National Pollutant Discharge Elimination System (NPDES) permit program, which regulates discharges to surface waters. The treated effluent from Sibley Lagoon is discharged into local waterways that eventually drain into the Sheyenne River, a tributary of the Red River of the North. The Red River flows north into Canada and ultimately into Lake Winnipeg. The plant's discharge contributes to the water quality of these downstream water bodies, which support diverse aquatic life and are important for regional ecology.

Sibley Lagoon discharges into local streams that feed the Sheyenne River, part of the Red River Basin. The Red River flows northward into Lake Winnipeg, a large freshwater lake that supports important fisheries and migratory bird populations. The region's flat terrain and agricultural land use mean that nutrient management is critical to prevent eutrophication in downstream waters.