Turtle Lake Lagoon Wastewater Treatment Plant, Turtle Lake, North Dakota

Turtle Lake Lagoon is a municipal wastewater treatment facility located in Turtle Lake, McLean County, North Dakota. The plant serves a small population of 581 residents, providing secondary treatment for the community's wastewater needs. As a lagoon-based system, it relies on natural biological processes to treat sewage before discharge. The plant operates under the US Clean Water Act, which requires secondary treatment for municipal wastewater discharges. With a designed capacity of 302.83 cubic meters per day and an average discharge volume of 227.13 cubic meters per day, the facility operates below its design capacity. The US Environmental Protection Agency (EPA) delegates permitting authority to the North Dakota Department of Environmental Quality, which issues National Pollutant Discharge Elimination System (NPDES) permits to ensure compliance with water quality standards. The treated effluent from Turtle Lake Lagoon is discharged into local surface waters that drain into the Missouri River watershed. The Missouri River flows through North Dakota and ultimately joins the Mississippi River, contributing to the Gulf of Mexico ecosystem. The plant's secondary treatment helps protect downstream aquatic habitats and supports the ecological health of the region's water resources.

Turtle Lake Lagoon discharges into local streams that are part of the Missouri River basin. The Missouri River flows through North Dakota and eventually reaches the Gulf of Mexico, supporting diverse aquatic life including fish and migratory birds. The plant's secondary treatment reduces organic pollutants and suspended solids, helping maintain water quality in downstream ecosystems.