McMillan Township STP - Secondary Wastewater Treatment in Michigan, USA

McMillan Township STP is a municipal wastewater treatment facility located in McMillan Township, Ontonagon County, Michigan. Serving a small population of 535, the plant provides secondary treatment to meet state and federal water quality standards. The facility is situated in the Upper Peninsula, a region characterized by forests, lakes, and cold winters. The plant operates under the U.S. Clean Water Act, which requires secondary treatment for municipal wastewater. With a designed capacity of 340.69 volume units and a discharge volume of 302.83, the plant manages typical flows for a small community. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into nearby streams that drain into Lake Superior, the largest of the Great Lakes. This watershed supports diverse aquatic life and provides drinking water for millions. The plant's location within 50 km of the coast but not within 10 km reduces direct marine impact, though its discharge contributes to the overall health of the Lake Superior basin.

The plant discharges into local tributaries that flow into Lake Superior, part of the Great Lakes system. This watershed is ecologically sensitive, supporting cold-water fisheries such as lake trout and whitefish. The region's forested landscape and seasonal snowmelt influence runoff patterns, making consistent treatment important for protecting downstream water quality and aquatic habitats.