Brown City STP - Secondary Wastewater Treatment in Worth Township, Michigan

Brown City STP is a municipal wastewater treatment plant located in Worth Township, Sanilac County, Michigan, United States. The facility serves a population of 1,272 and is part of the region's wastewater infrastructure for rural communities in the eastern part of the state. The plant provides secondary treatment, which is the standard level required by the US Clean Water Act for municipal facilities. With a designed capacity of 757.08 million gallons per year and an annual discharge volume of 492.10 million gallons, the plant operates at approximately 65% capacity. As a US facility, it operates under a National Pollutant Discharge Elimination System (NPDES) permit issued by the Michigan Department of Environment, Great Lakes, and Energy (EGLE), which sets effluent limits to protect water quality. The treated effluent is discharged into local waterways that drain into the Lake Huron basin, part of the Great Lakes system. The plant's location within 50 km of the coast means its discharge ultimately reaches Lake Huron, a vital freshwater resource supporting diverse aquatic life and providing drinking water for millions. The facility plays a key role in protecting downstream water quality in the Lake Huron watershed.

The plant discharges into the Lake Huron basin, part of the Great Lakes system. Lake Huron is a large freshwater lake that supports a diverse ecosystem, including fish species such as lake trout and walleye, and provides habitat for migratory birds. The watershed includes agricultural and rural areas, and the plant's secondary treatment helps reduce nutrient loading that could contribute to algal blooms in the lake.