ST CHARLES STP - Advanced Wastewater Treatment in Swan Creek Township, Michigan

ST CHARLES STP (Sewage Treatment Plant) is located at 125 Entrepreneur Drive in Swan Creek Township, Saginaw County, Michigan. This facility serves a population of approximately 2,075 residents, operating as part of the municipal wastewater infrastructure for the surrounding community. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 908.50 megaliters and an annual discharge volume of 719.23 megaliters, the facility operates under the U.S. Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all point source discharges. As an advanced treatment plant, it meets stringent effluent limits to protect water quality. The treated effluent is discharged into local waterways that drain into the Saginaw River system, ultimately reaching Saginaw Bay and Lake Huron. This watershed supports diverse aquatic life and provides recreational and drinking water resources. The plant's advanced treatment helps reduce nutrient loading, which is critical for preventing algal blooms in the Great Lakes ecosystem.

The plant discharges into the Saginaw River watershed, which flows into Saginaw Bay, a shallow extension of Lake Huron. This region is ecologically sensitive due to its role as a spawning and nursery habitat for fish species such as walleye and yellow perch. Nutrient pollution from wastewater can contribute to harmful algal blooms in the bay, making advanced treatment important for protecting the Great Lakes ecosystem.