Evansville WWTF - Secondary Wastewater Treatment Plant in Evansville, Minnesota

Evansville Wastewater Treatment Facility (WWTF) is a municipal wastewater treatment plant located in Evansville, Minnesota, United States. The plant serves a small population of 621 residents, providing secondary treatment to manage domestic wastewater from the community. As a facility in the Upper Midwest, it operates under the regulatory framework of the U.S. Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges to surface waters. The plant has a designed capacity of 378.54 cubic meters per day and a reported discharge volume of 378.54 cubic meters per day, indicating full utilization of its capacity. Secondary treatment, which typically involves biological processes to remove organic matter and suspended solids, is the standard for municipal plants of this scale in the United States. The treated effluent from Evansville WWTF is discharged into a local water body, which ultimately drains into the Mississippi River Basin. The plant plays a key role in protecting downstream water quality, including the Minnesota River and the Upper Mississippi River, by reducing pollutant loads before discharge. This helps maintain aquatic habitat and supports recreational and drinking water uses in the region.

Evansville WWTF discharges into a local stream that flows into the Pomme de Terre River, a tributary of the Minnesota River, which then joins the Mississippi River. The Mississippi River Basin is a major ecological corridor supporting diverse fish and wildlife, including migratory birds and endangered species. The plant's secondary treatment helps reduce nutrient and organic pollution, mitigating eutrophication risks in downstream lakes and the Gulf of Mexico hypoxic zone.