Jamestown SD 3 STP Wastewater Treatment Plant, Town of Jamestown, Wisconsin

Jamestown SD 3 STP is a municipal wastewater treatment plant located in the Town of Jamestown, Grant County, Wisconsin. It serves a small population of 95 residents, reflecting its role as a rural community facility. The plant operates under the regulatory framework of the US Clean Water Act, which requires secondary treatment for all publicly owned treatment works. The plant provides secondary treatment, a standard biological process that removes biodegradable organic matter and suspended solids. With a designed capacity of 34.07 million gallons per year and an actual discharge volume of 22.71 million gallons per year, the plant operates below its capacity. This suggests adequate headroom for current demand. The treated effluent is discharged into a local water body that ultimately drains into the Mississippi River basin. The plant's location in southwestern Wisconsin places it within the Driftless Area, a region known for its spring-fed streams and diverse aquatic habitats. Proper treatment helps protect downstream water quality in the Mississippi River and the Gulf of Mexico.

The plant discharges into a tributary of the Grant River, which flows into the Mississippi River near the Illinois border. The Mississippi River is a major ecological corridor supporting diverse fish and migratory bird species. The Driftless Area's karst topography makes groundwater particularly sensitive to contamination, so effective wastewater treatment is critical for protecting local springs and streams.