LEHR LAGOON Wastewater Treatment Plant, Logan County, North Dakota

LEHR LAGOON is a wastewater treatment facility located along State Highway 30 in rural Logan County, North Dakota. It serves a small population of 80 residents, reflecting the sparse settlement pattern of the Great Plains region. The plant provides secondary treatment, which is the standard biological treatment stage required by the US Clean Water Act for municipal wastewater. With a designed capacity of 37.85 megaliters per year, the facility operates under the National Pollutant Discharge Elimination System (NPDES) permit program, administered by the North Dakota Department of Environmental Quality. The treated effluent is discharged into local surface waters that drain into the Missouri River watershed, ultimately reaching the Gulf of Mexico. The plant plays a vital role in protecting groundwater and nearby streams from untreated sewage, supporting the ecological health of the prairie landscape.

The plant discharges into small streams within the Missouri River basin, which flows into the Mississippi River and then the Gulf of Mexico. This watershed supports diverse aquatic life and is an important migratory corridor for birds. The surrounding prairie ecosystem relies on clean water for livestock and wildlife.