LEWISTON STP - Wastewater Treatment Plant in Lewiston, Minnesota

LEWISTON STP is a municipal wastewater treatment plant located in Lewiston, Minnesota, serving a population of about 1,647. The facility is situated in Winona County, part of the Upper Midwest region of the United States. As a small-scale plant, LEWISTON STP is subject to the U.S. Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permitting requirements. For plants of this size, secondary treatment is typically mandated to reduce organic pollutants and suspended solids before discharge. The treated effluent from LEWISTON STP is released into the local watershed, which ultimately drains into the Mississippi River via tributaries. The Mississippi River is a major ecological corridor supporting diverse aquatic life and migratory birds, and its water quality is protected under federal and state regulations.

LEWISTON STP discharges into the local watershed that feeds into the Mississippi River, a major North American waterway. The Mississippi River supports a wide range of aquatic species and provides critical habitat for migratory birds. Downstream, the river flows into the Gulf of Mexico, where nutrient loading can contribute to hypoxic zones. The plant's treatment processes help mitigate local impacts on this ecologically significant river system.