Tolna Lagoon Wastewater Treatment Plant, Tolna, North Dakota

Tolna Lagoon is a municipal wastewater treatment facility located in Tolna, a small town in Nelson County, North Dakota. The plant serves a population of 166 residents and operates as a lagoon system providing secondary treatment, which is typical for small communities in the region. The plant has a designed capacity of 75.71 megaliters and discharges approximately 60.57 megaliters of treated wastewater annually. As a secondary treatment facility, it meets the standard requirements under the U.S. Clean Water Act for reducing organic pollutants and suspended solids before discharge. The treated effluent is released into local surface waters that eventually drain into the Red River Basin, which flows north into Canada and ultimately into Lake Winnipeg. The plant plays a key role in protecting downstream water quality in this ecologically sensitive prairie watershed.

Tolna Lagoon discharges into local waterways that are part of the Red River Basin, which flows northward through North Dakota and Manitoba into Lake Winnipeg. This basin supports diverse aquatic life and is an important migratory corridor for waterfowl. The plant's secondary treatment helps reduce nutrient loading, which is critical for preventing eutrophication in downstream lakes and rivers.