ST JOHN LAGOON Wastewater Treatment Plant, St. John, North Dakota

ST JOHN LAGOON is a municipal wastewater treatment plant located in St. John, North Dakota, United States. The facility serves a small community of 341 residents, reflecting the rural character of the region. The plant is situated in Rolette County, near the Canadian border. The plant provides secondary treatment, which is the standard level required under the US Clean Water Act for municipal wastewater facilities. Secondary treatment typically involves biological processes to remove organic matter and suspended solids. The plant's designed capacity matches its current discharge volume of 75.71 units, indicating it operates at full capacity. The treated effluent from ST JOHN LAGOON is discharged into the local watershed, which ultimately drains into the Souris River basin. The Souris River flows north into Canada, eventually reaching Hudson Bay. The plant's operations help protect downstream water quality and aquatic ecosystems in this transboundary river system.

The plant discharges into the Souris River watershed, a tributary of the Assiniboine River that flows into the Red River of the North and ultimately Hudson Bay. This region supports diverse aquatic life and is an important migratory corridor for waterfowl. The plant's secondary treatment helps reduce nutrient loading and protect downstream ecosystems.