SOLEN LAGOON Wastewater Treatment Plant, Solen, North Dakota

SOLEN LAGOON is a wastewater treatment facility located on River Street in Solen, North Dakota, within Sioux County. Serving a population of 47, this small-scale plant provides secondary treatment for the community's municipal wastewater. As a secondary treatment plant, SOLEN LAGOON meets the standard requirements under the US Clean Water Act for reducing organic matter and suspended solids. The plant's designed capacity and discharge volume are both 37.85 units, indicating a consistent operational scale. Facilities of this size in the United States are typically regulated under the National Pollutant Discharge Elimination System (NPDES) permit program, administered by the state or EPA. The plant's treated effluent is discharged into the local watershed, which ultimately drains into the Missouri River system. This river basin supports diverse aquatic life and provides water for agricultural and recreational uses downstream. The plant's proximity to the coast (within 10 km) is noted, though Solen is inland; this likely refers to a nearby water body or a data artifact.

SOLEN LAGOON discharges into the Missouri River watershed, a major tributary of the Mississippi River that flows into the Gulf of Mexico. The receiving waters support a variety of fish and wildlife, including migratory birds and endangered species like the pallid sturgeon. The plant's secondary treatment helps reduce nutrient loading, which is critical for preventing downstream hypoxia in the Gulf.