Marshall STP Wastewater Treatment Plant, Wisconsin

Marshall STP is a municipal wastewater treatment facility located in Marshall, Dane County, Wisconsin. Serving a population of about 3,864, the plant is part of the region's infrastructure for managing domestic wastewater. The facility is situated inland, away from coastal areas, and its operations are subject to state and federal environmental regulations. Under the US Clean Water Act, wastewater treatment plants of this scale are typically required to meet secondary treatment standards. The National Pollutant Discharge Elimination System (NPDES) permits, issued by the Wisconsin Department of Natural Resources, govern discharge limits and monitoring requirements. The plant is expected to comply with these regulatory frameworks to ensure adequate treatment before discharge. The treated effluent from Marshall STP is discharged into a local water body that ultimately drains into the Mississippi River basin. This watershed supports diverse aquatic life and provides water resources for communities downstream. The plant's operation plays a role in maintaining water quality in the region, contributing to the ecological health of the broader drainage system.

Marshall STP discharges into a tributary of the Rock River, which flows into the Mississippi River. The Mississippi River basin is a major ecological corridor supporting numerous fish species, migratory birds, and aquatic habitats. The plant's effluent must meet water quality standards to protect these downstream ecosystems, particularly in an agricultural region where nutrient loading can impact river health.