Glen Ullin Lagoon Wastewater Treatment Plant, Glen Ullin, North Dakota

Glen Ullin Lagoon is a municipal wastewater treatment facility located in Glen Ullin, Morton County, North Dakota. The plant serves a small population of 807 residents, providing secondary treatment through lagoon-based processes typical for rural communities in the Great Plains region. The plant operates under the US Clean Water Act, which requires secondary treatment for municipal wastewater discharges. With a designed capacity of 264.98 million gallons per year and an average discharge volume of 227.13 million gallons per year, the facility manages the community's wastewater within its capacity. The regulatory framework ensures compliance with National Pollutant Discharge Elimination System (NPDES) permits issued by the North Dakota Department of Environmental Quality. The treated effluent from Glen Ullin Lagoon is discharged into local surface waters that ultimately drain into the Missouri River watershed. The Missouri River basin supports diverse aquatic life and provides critical habitat for migratory birds. The plant's secondary treatment helps protect downstream water quality in this agriculturally important region.

The plant discharges into local streams that flow into the Missouri River, a major tributary of the Mississippi River system. The Missouri River basin in North Dakota supports species such as pallid sturgeon and piping plover, and the region's wetlands provide important stopover habitat for migratory waterfowl. Secondary treatment reduces organic pollutants and suspended solids, helping maintain water quality in this semi-arid agricultural landscape.