Lake Linden STP - Secondary Wastewater Treatment Plant in Torch Lake Township, Michigan

Lake Linden STP is a municipal wastewater treatment plant located in Torch Lake Township, Houghton County, Michigan. It serves a small community of approximately 1,048 residents, providing essential sanitation services for the area. The plant operates at the secondary treatment level, which is the standard required by the US Clean Water Act for municipal facilities. It has a designed capacity of 454.25 volume units, with a similar discharge volume, indicating it is operating near its designed capacity. As a US facility, it is regulated under the National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect water quality. The treated effluent is discharged into the local watershed, which drains into the Keweenaw Waterway and ultimately into Lake Superior, the largest of the Great Lakes. Lake Superior is a critical freshwater resource with sensitive aquatic ecosystems, including native fish populations and cold-water habitats. The plant's secondary treatment helps reduce nutrient and pollutant loads to protect this important water body.

The plant discharges into the Keweenaw Waterway, a natural waterway that connects to Lake Superior. Lake Superior is a vast oligotrophic lake with low nutrient levels, supporting cold-water fish species like lake trout and whitefish. The region's watershed is forested and sparsely populated, making the plant's effluent a potential local source of nutrients and contaminants. Secondary treatment reduces biochemical oxygen demand and suspended solids, helping to maintain the lake's water quality and ecological balance.