Spooner WWTP - Secondary Wastewater Treatment in Spooner, Wisconsin

Spooner WWTP is a municipal wastewater treatment facility located in Spooner, Wisconsin, serving a population of approximately 3,181 residents. The plant provides secondary treatment, a standard level for communities of this size in the United States, ensuring effective removal of organic matter and suspended solids before discharge. The plant has a designed capacity of 1,419.53 thousand gallons per day and currently processes an average daily flow of 938.78 thousand gallons, operating well within its capacity. As a publicly owned treatment works (POTW), it is subject to the US Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permitting, administered by the Wisconsin Department of Natural Resources. The treated effluent is discharged into a local receiving water body, which ultimately drains into the Mississippi River Basin. This discharge supports downstream aquatic ecosystems and water quality in the region. The plant's inland location reduces direct marine impact, but its performance is critical for maintaining the health of local streams and rivers.

Spooner WWTP discharges into a tributary of the Namekagon River, which flows into the St. Croix River and eventually the Mississippi River. The Namekagon-St. Croix system is a National Scenic Riverway, supporting diverse aquatic life including cold-water fish species. The plant's secondary treatment helps protect this ecologically sensitive watershed from nutrient pollution and pathogen contamination.