Walhalla Lagoon Wastewater Treatment Plant, Walhalla, North Dakota

Walhalla Lagoon is a municipal wastewater treatment facility located in Walhalla, North Dakota, serving a population of 996. The plant provides secondary treatment, a standard level for small communities in the United States, and is part of the region's infrastructure for managing domestic wastewater. The plant has a designed capacity of 340.69 volume units and discharges a similar volume, indicating full utilization. As a lagoon system, it relies on natural biological processes to treat wastewater. Under the US Clean Water Act, such facilities must comply with National Pollutant Discharge Elimination System (NPDES) permits, which set effluent limits to protect water quality. The treated effluent is discharged into local waterways that drain into the Pembina River, a tributary of the Red River of the North, which flows into Lake Winnipeg. This watershed supports diverse aquatic life and is important for regional agriculture and recreation. The plant's operation helps maintain the ecological health of these downstream environments.

Walhalla Lagoon discharges into local streams that feed the Pembina River, part of the Red River of the North basin. This river system flows north into Lake Winnipeg, a large freshwater lake in Canada. The watershed supports a variety of fish and wildlife, and the plant's secondary treatment helps reduce nutrient loads that could contribute to algal blooms in downstream waters.