North Branch Municipal Water Treatment Plant - Minnesota Wastewater Facility

The North Branch Municipal Water Treatment Plant (WTP) is located at 6785 Birch Street in North Branch, Chisago County, Minnesota. This facility serves a population of about 10,545 people, classifying it as a medium-sized municipal treatment plant in the Upper Midwest region of the United States. As a publicly owned treatment works (POTW) in Minnesota, the plant is subject to the U.S. Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permitting requirements. For a community of this size, typical treatment includes secondary biological processes to meet effluent limits set by the Minnesota Pollution Control Agency (MPCA). The plant's design and operation must comply with state water quality standards to protect receiving waters. The plant's treated effluent discharges to a local water body within the St. Croix River watershed, which flows into the Mississippi River and ultimately to the Gulf of Mexico. The St. Croix River is a National Scenic Riverway, supporting diverse aquatic life and recreational uses. Proper treatment at this plant helps maintain water quality in this ecologically significant river system.

The plant discharges to a tributary of the St. Croix River, a major tributary of the Mississippi River. The St. Croix River watershed supports diverse fish populations, including walleye and smallmouth bass, and provides critical habitat for migratory birds. Downstream, the Mississippi River carries treated effluent to the Gulf of Mexico, where nutrient loading contributes to seasonal hypoxic zones. Effective treatment at this plant helps reduce local and downstream nutrient impacts.