Rock Springs STP - Wastewater Treatment Plant in Rock Springs, Wisconsin

Rock Springs STP is a municipal wastewater treatment facility located on Holtz Street in Rock Springs, Sauk County, Wisconsin. The plant serves a small population of 417 residents, reflecting the rural character of the community. As a secondary treatment plant, it provides biological treatment to remove organic matter and suspended solids before discharge. The plant has a designed capacity of 287.69 million gallons per year and currently treats an annual discharge volume of 140.06 million gallons. Under the US Clean Water Act, facilities of this scale are typically regulated through National Pollutant Discharge Elimination System (NPDES) permits issued by the Wisconsin Department of Natural Resources. These permits set effluent limits to protect water quality. The treated effluent is discharged to a local water body, likely a tributary of the Wisconsin River, which flows into the Mississippi River and ultimately the Gulf of Mexico. The plant's operations contribute to protecting downstream aquatic ecosystems and maintaining water quality in the region.

The plant discharges into a local stream within the Wisconsin River basin, which drains into the Mississippi River and eventually the Gulf of Mexico. The watershed supports diverse aquatic life and is an important migratory corridor for fish. The plant's secondary treatment helps reduce nutrient loads that could otherwise contribute to algal blooms in downstream waters.