MOUNTAIN LAGOON Wastewater Treatment Plant, Pembina County, North Dakota

MOUNTAIN LAGOON is a wastewater treatment plant located in rural Pembina County, North Dakota, United States. It serves a small population of 92 residents, reflecting the sparse settlement pattern of the region. The plant is situated near 88th Street Northeast, in an area characterized by agricultural land and prairie ecosystems. The plant operates at the secondary treatment level, which is the standard required by the US Clean Water Act for municipal wastewater facilities. With a designed capacity of 75.71 megaliters and an annual discharge volume of 37.85 megaliters, the plant operates well below its capacity. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids before discharge. The treated effluent is released into local waterways that drain into the Red River Basin, ultimately flowing north into Lake Winnipeg in Canada. The plant's inland location, far from coastal areas, reduces direct marine impact. Its small scale and secondary treatment align with typical requirements for rural communities under the National Pollutant Discharge Elimination System (NPDES) permitting framework.

The plant discharges into tributaries of the Red River, which flows northward through North Dakota and Manitoba into Lake Winnipeg. This watershed supports diverse aquatic life and is an important migratory corridor for waterfowl. The region's flat terrain and agricultural runoff can contribute nutrient loads, making effective secondary treatment crucial for protecting downstream water quality.