Marmarth Lagoon Wastewater Treatment Plant, Marmarth, North Dakota

Marmarth Lagoon is a wastewater treatment facility located in Marmarth, Slope County, North Dakota. It serves a small population of 95 residents, typical of rural communities in the Great Plains region. The plant provides secondary treatment, a standard level for small agglomerations in the United States. The plant's designed capacity is 75.71 cubic meters, matching its discharge volume, indicating consistent operation. As a US facility, it operates under the Clean Water Act, with NPDES permits issued by the state of North Dakota. Secondary treatment is required for all municipal plants, ensuring removal of organic matter and suspended solids. The treated effluent is discharged into local waterways, likely tributaries of the Little Missouri River, which flows into the Missouri River and ultimately the Mississippi River system. This watershed supports diverse aquatic life and is part of the larger Mississippi Basin, a critical ecological and economic resource.

The plant discharges into the Little Missouri River watershed, which drains into the Missouri River and then the Mississippi River. This region is part of the Great Plains ecosystem, characterized by semi-arid climate and prairie habitats. The receiving waters support fish species such as catfish and walleye, and the watershed provides important migratory corridors for birds.