Marion Lagoon Wastewater Treatment Plant, Marion, North Dakota

Marion Lagoon is a wastewater treatment facility located in Marion, North Dakota, serving a small population of 133 residents. The plant is situated in Sheridan Township, LaMoure County, and provides secondary treatment for municipal wastewater. The plant has a designed capacity of 37.85 million gallons per year and discharges a similar volume annually. As a secondary treatment facility, it meets the minimum requirements under the US Clean Water Act for municipal wastewater treatment, which mandates secondary treatment for all publicly owned treatment works. The treated effluent is discharged into local waterways, contributing to the protection of the James River watershed and ultimately the Missouri River basin. The plant's inland location and small scale help minimize environmental impact on downstream ecosystems.

The plant discharges into the James River watershed, which flows north through North Dakota into the Missouri River. The Missouri River then joins the Mississippi River, draining into the Gulf of Mexico. The surrounding region is primarily agricultural, and the plant's secondary treatment helps reduce nutrient loading and protect aquatic habitats in the downstream river systems.