Ashippun SD STP - Secondary Wastewater Treatment Plant in Town of Lebanon, Wisconsin

Ashippun SD STP (Sanitary District Treatment Plant) is a municipal wastewater facility located in the Town of Lebanon, Dodge County, Wisconsin. The plant serves a population of approximately 2,000 residents, providing secondary treatment to meet state and federal water quality standards. As a small-scale facility, it plays a key role in managing local wastewater in this rural community. The plant operates under the U.S. Clean Water Act, which requires secondary treatment for municipal wastewater discharges. With a designed capacity of 764.65 cubic meters per day and an average daily flow of 473.18 cubic meters, the facility operates below its maximum capacity, indicating room for future growth. The treatment process is secondary, typically involving biological treatment to reduce organic matter and suspended solids. The treated effluent is discharged into local waterways that drain into the Rock River basin, ultimately reaching the Mississippi River and the Gulf of Mexico. The plant's operations help protect downstream water quality and aquatic habitats in the region.

The plant discharges into tributaries of the Rock River, which flows southward through Wisconsin and Illinois before joining the Mississippi River. The Rock River watershed supports diverse aquatic life, including fish species such as walleye and smallmouth bass. Downstream, the Mississippi River is a major ecological corridor for migratory birds and aquatic species. The plant's secondary treatment helps reduce nutrient loading and protect these water bodies from eutrophication.