MILTON STP Wastewater Treatment Plant, Milton, Wisconsin

MILTON STP is a municipal wastewater treatment plant located in Milton, Rock County, Wisconsin, serving a population of about 5,412. The facility is operated by the City of Milton Department of Public Works and is situated in the Rock River basin, which ultimately drains into the Mississippi River system. As a plant serving a small agglomeration, MILTON STP is subject to U.S. EPA National Pollutant Discharge Elimination System (NPDES) permitting requirements under the Clean Water Act. For communities of this size, secondary treatment is typically required, and permits specify effluent limits to protect receiving water quality. The plant's design capacity and treatment process details are not publicly available, but the regulatory framework ensures compliance with state and federal standards. The treated effluent from MILTON STP discharges into local waterways that feed into the Rock River, a tributary of the Mississippi River. This watershed supports diverse aquatic life and provides recreational and drinking water resources downstream. The plant's operation is critical for maintaining water quality in the region and preventing nutrient pollution that could affect the larger Mississippi River ecosystem.

MILTON STP discharges into the Rock River watershed, which flows southward through Wisconsin and Illinois before joining the Mississippi River. The Rock River supports a variety of fish species and provides habitat for migratory birds. Downstream, the Mississippi River is a major ecological corridor, and nutrient loading from wastewater can contribute to hypoxic zones in the Gulf of Mexico. The plant's treatment performance is therefore important for both local water quality and broader downstream environmental health.