Beloit WWTP - Town of Clinton, Wisconsin Wastewater Treatment Plant

Beloit WWTP is a municipal wastewater treatment facility located at 7832 State Line Road in the Town of Clinton, Rock County, Wisconsin. The plant serves an estimated population of 36,913, placing it in the medium-to-large agglomeration category for US facilities. Its location near the Wisconsin-Illinois border positions it within the Rock River watershed, which ultimately drains to the Mississippi River. As a US-based plant serving over 10,000 people, Beloit WWTP is subject to the National Pollutant Discharge Elimination System (NPDES) permitting program under the Clean Water Act. This regulatory framework requires secondary treatment as a minimum standard for municipal wastewater, with additional nutrient removal requirements in sensitive watersheds. The plant's discharge is managed through state-issued permits that specify effluent limits and monitoring requirements. The treated effluent from Beloit WWTP discharges to a receiving water body within the Rock River basin. The Rock River flows southward through Illinois before joining the Mississippi River near the Quad Cities. This downstream connection makes the plant's performance relevant to water quality in both the Rock River and the larger Mississippi River system, which supports diverse aquatic life and provides drinking water for millions downstream.

Beloit WWTP discharges into the Rock River watershed, which flows south through Illinois to the Mississippi River. The Rock River supports a variety of fish species and provides habitat for migratory waterfowl. Downstream, the Mississippi River is a major ecological corridor, and nutrient loading from wastewater plants in the basin can contribute to hypoxia in the Gulf of Mexico. The plant's location in an agricultural region also means its effluent interacts with runoff from surrounding farmland.