Sebewaing WWSL - Secondary Wastewater Treatment Plant in Sebewaing Township, Michigan

Sebewaing WWSL is a municipal wastewater treatment plant located in Sebewaing Township, Huron County, Michigan. The facility serves a population of approximately 1,923 residents and operates under the regulatory framework of the US Clean Water Act, which requires NPDES permits for discharges to surface waters. The plant provides secondary treatment, a standard level for small communities in the United States. With a designed capacity of 1,135.62 m³/day and an average discharge volume of 757.08 m³/day, the facility operates at about 67% capacity, indicating room for future growth. The treated effluent is discharged into the Lake Huron watershed, part of the Great Lakes system. Lake Huron is a critical freshwater resource supporting diverse aquatic life and providing drinking water for millions. The plant's proximity to the coast (within 10 km) underscores the importance of effective nutrient removal to protect the lake's water quality.

The plant discharges into the Lake Huron basin, which drains into the St. Clair River, Lake St. Clair, and the Detroit River before reaching Lake Erie. Lake Huron is a vital freshwater ecosystem supporting fish populations and migratory birds. The plant's coastal location requires careful management of nutrients and pathogens to prevent eutrophication and protect recreational water quality.