ROLLA LAGOON Wastewater Treatment Plant, Rolla, North Dakota

ROLLA LAGOON is a municipal wastewater treatment facility located in Rolla, North Dakota, United States. It serves a population of approximately 1,280 residents, making it a small-scale plant typical of rural communities in the region. The plant is situated in Rolette County, near the Canadian border, and operates under the regulatory framework of the U.S. Clean Water Act. The plant provides secondary treatment, which is the standard level required for municipal wastewater in the United States under the National Pollutant Discharge Elimination System (NPDES). Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant's designed capacity is 416.39 cubic meters per day, and it currently treats an average daily flow of 378.54 cubic meters, indicating it operates below its design capacity. The treated effluent is discharged into a local water body, likely a stream or wetland that drains into the Souris River basin. The Souris River flows north into Canada and eventually into Hudson Bay. The plant's discharge supports the local hydrology but requires careful management to protect downstream aquatic ecosystems, particularly during low-flow periods.

The plant's discharge enters a local watercourse that is part of the Souris River watershed. The Souris River flows northward through North Dakota into Manitoba, Canada, and eventually drains into Hudson Bay via the Nelson River system. The region is characterized by prairie pothole wetlands and agricultural land, making the receiving waters sensitive to nutrient loading. Proper treatment helps protect downstream habitats that support migratory birds and fish species.