Stanley WWTP - Town of Delmar, Wisconsin Wastewater Treatment Plant

Stanley WWTP is a municipal wastewater treatment facility located on State Highway 29 in the Town of Delmar, Chippewa County, Wisconsin. It serves a population of approximately 3,620 residents, classifying it as a small to medium agglomeration under U.S. Environmental Protection Agency (EPA) guidelines. As a U.S. facility, the plant operates under the National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect water quality. For plants of this scale, secondary treatment is typically required to reduce biochemical oxygen demand and suspended solids before discharge. The treated effluent is released into local streams that drain into the Chippewa River, a tributary of the Mississippi River. This watershed supports diverse aquatic life and is important for regional water quality and recreation.

The plant's discharge enters the Chippewa River watershed, which flows into the Mississippi River and ultimately the Gulf of Mexico. This basin supports a variety of fish species and provides habitat for migratory birds. Protecting water quality in this region is critical to maintaining the ecological health of the Mississippi River system and reducing nutrient loading in the Gulf.