Bay City STP - Municipal Wastewater Treatment Plant in Bay City, Michigan

Bay City STP is a municipal wastewater treatment plant located at 2917 North Water Street in Bay City, Michigan. The facility serves an estimated population of 45,800, classifying it as a medium-sized agglomeration within the Great Lakes region. Its location along the Saginaw River places it in a watershed of significant ecological and economic importance. As a US-based plant, Bay City STP operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permitting. For a facility serving this population size, secondary treatment is typically required as a minimum standard. The plant's treated effluent is discharged into the Saginaw River, which flows northward into Saginaw Bay, a large freshwater bay of Lake Huron. This water body supports diverse aquatic life, including fish species such as walleye and yellow perch, and provides critical habitat for migratory birds. The Saginaw Bay watershed is also a major recreational and commercial fishing area, making effective wastewater treatment essential for maintaining water quality and ecosystem health.

Bay City STP discharges into the Saginaw River, which flows into Saginaw Bay and ultimately Lake Huron, part of the Great Lakes system. The Saginaw Bay watershed supports diverse aquatic life, including fish species like walleye and yellow perch, and provides critical habitat for migratory birds. Effective treatment is essential to protect these resources from nutrient pollution and pathogens, especially given the bay's role in recreation and commercial fishing.