LEXINGTON STP - Secondary Wastewater Treatment in Lexington Township, Michigan

LEXINGTON STP is a municipal wastewater treatment facility located in Lexington Township, Sanilac County, Michigan. The plant serves a population of approximately 1,064 residents, reflecting a small community-scale operation in the Great Lakes region. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 757.08 units and an average discharge volume of 529.96 units, the facility operates below its capacity. Under the U.S. Clean Water Act, such plants are regulated through National Pollutant Discharge Elimination System (NPDES) permits issued by the Michigan Department of Environment, Great Lakes, and Energy (EGLE), ensuring compliance with water quality standards. The treated effluent is discharged into the Lake Huron watershed, a vital freshwater ecosystem. Lake Huron supports diverse aquatic life and provides drinking water for millions. The plant's proximity to the coast (within 10 km) underscores the importance of effective treatment to protect the lake's ecological health and recreational uses.

The plant discharges into the Lake Huron basin, part of the Great Lakes system, which ultimately drains into the St. Lawrence River and the Atlantic Ocean. Lake Huron supports a rich aquatic ecosystem, including fish species like lake trout and walleye, and provides critical habitat for migratory birds. The coastal location necessitates careful nutrient management to prevent algal blooms and maintain water quality.