Stephenson WTP Wastewater Treatment Plant, Stephenson Township, Michigan

Stephenson WTP is a municipal wastewater treatment facility located on Robert Street in Stephenson Township, Menominee County, Michigan. The plant serves a small population of 875 residents in this rural Upper Peninsula community, providing essential sanitation services to the area. The facility operates at the secondary treatment level, which is the minimum standard required under the U.S. Clean Water Act for municipal wastewater plants. With a designed capacity of 567.81 cubic meters per day and an average daily discharge volume of 340.69 cubic meters, the plant maintains a utilization rate well within its operational limits. As a small agglomeration, it is subject to state-level NPDES permitting through the Michigan Department of Environment, Great Lakes, and Energy (EGLE). The treated effluent from Stephenson WTP is discharged into local surface waters that ultimately drain into Lake Michigan via the Menominee River system. Lake Michigan, part of the Great Lakes ecosystem, supports diverse aquatic life and provides drinking water for millions. The plant's inland location, over 10 kilometers from the coast, reduces direct marine impact but still requires careful nutrient management to protect the sensitive Great Lakes watershed.

The plant discharges into tributaries of the Menominee River, which flows into Green Bay and then Lake Michigan. Lake Michigan is a critical freshwater resource supporting diverse fish populations, including lake trout and whitefish, and serves as a major migratory corridor for birds. The watershed is ecologically sensitive to nutrient loading, which can contribute to algal blooms in the Great Lakes. Stephenson WTP's secondary treatment helps reduce organic pollutants, but nutrient removal may be limited without tertiary processes.