Sault Ste. Marie STP - Michigan Wastewater Treatment Plant Serving 14,300

The Sault Ste. Marie STP is a municipal wastewater treatment facility located in Sault Ste. Marie, Michigan, serving a population of about 14,300. The plant is situated near the St. Marys River, which connects Lake Superior to Lake Huron, and is within 50 km of the Lake Huron coastline. As a US facility, the plant operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Michigan Department of Environment, Great Lakes, and Energy (EGLE). For a community of this size, secondary treatment is typically required, and the plant's designed capacity is 1.00 million gallons per day, indicating it is sized to handle the local wastewater load. The plant's effluent is discharged into the St. Marys River, a critical waterway in the Great Lakes system. The river supports diverse aquatic life, including fish species such as lake trout and whitefish, and is an important migratory corridor. The discharge ultimately reaches Lake Huron, one of the largest freshwater lakes in the world, which provides drinking water and recreational opportunities for millions.

The Sault Ste. Marie STP discharges into the St. Marys River, which flows from Lake Superior to Lake Huron. This river is part of the Great Lakes Basin, a globally significant freshwater ecosystem. The area supports diverse aquatic habitats, including wetlands and spawning grounds for fish. Protecting water quality in this river is essential for the health of Lake Huron and the broader Great Lakes system.