Plainwell STP - Wastewater Treatment Plant in Plainwell, Michigan, United States

Plainwell STP is a municipal wastewater treatment plant located at 215 Fairlane Street in Plainwell, Michigan, serving a population of about 6,200. The plant is part of the city's infrastructure and operates under the regulatory framework of the U.S. Clean Water Act, administered by the Michigan Department of Environment, Great Lakes, and Energy (EGLE). As a small to medium-sized facility, it is subject to National Pollutant Discharge Elimination System (NPDES) permitting requirements that set effluent limits based on the receiving water body's water quality standards. Under the Clean Water Act, municipal treatment plants of this scale are typically required to provide secondary treatment, which includes biological processes to remove organic matter and suspended solids. The plant's treatment process and capacity details are not publicly available, but the regulatory framework ensures that the facility meets state and federal standards for effluent quality. The plant's design and operation are overseen by the city of Plainwell, with compliance monitoring by EGLE. The treated wastewater from Plainwell STP is discharged into the Kalamazoo River, which flows westward through southwestern Michigan and eventually drains into Lake Michigan at Saugatuck. The Kalamazoo River watershed supports diverse aquatic life, including fish species such as steelhead and salmon, and is an important recreational and ecological resource. The plant's discharge must meet water quality standards to protect the river's beneficial uses, including aquatic habitat and downstream drinking water supplies.

Plainwell STP discharges to the Kalamazoo River, a major waterway in southwestern Michigan that flows approximately 130 miles to Lake Michigan. The river supports a diverse ecosystem, including coldwater fisheries and migratory fish species. The watershed is also used for recreation, agriculture, and municipal water supply. The plant's effluent must comply with state water quality standards to protect these downstream uses and the ecological health of the river and Lake Michigan.