Deer Park STP - Secondary Wastewater Treatment in Deer Park, Wisconsin

Deer Park STP is a municipal wastewater treatment facility located in Deer Park, Wisconsin, serving a small population of 241 residents. The plant provides secondary treatment, which is the standard level required by the U.S. Clean Water Act for most municipal facilities to reduce organic pollutants and suspended solids before discharge. The plant's designed capacity is 113.56 million gallons per year, and it discharges an average of 128.70 million gallons annually, indicating it operates near or slightly above its design capacity. As a small facility in the Upper Midwest, it is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Wisconsin Department of Natural Resources, which set effluent limits to protect local water quality. The treated effluent from Deer Park STP is discharged into a local water body that ultimately drains into the St. Croix River, a tributary of the Mississippi River. The St. Croix River is a National Scenic Riverway known for its ecological significance, supporting diverse aquatic life and providing recreational opportunities. The plant's operations are critical to maintaining water quality in this sensitive watershed.

The Deer Park STP discharges into a local stream that flows into the St. Croix River, a major tributary of the Mississippi River. The St. Croix River is designated as a National Scenic Riverway and supports diverse aquatic ecosystems, including fish species such as walleye and smallmouth bass. The plant's secondary treatment helps protect downstream water quality in this ecologically sensitive river system.