Gresham WWTP - Secondary Wastewater Treatment in Gresham, Wisconsin

Gresham WWTP is a municipal wastewater treatment plant located in Gresham, Wisconsin, United States. The facility serves a small population of 583 residents, reflecting the rural character of the Shawano County area. As a secondary treatment plant, it provides biological treatment to remove organic matter and suspended solids from wastewater. The plant operates under the U.S. Clean Water Act, which requires secondary treatment for municipal wastewater discharges. The National Pollutant Discharge Elimination System (NPDES) permit program, administered by the Wisconsin Department of Natural Resources, governs the plant's discharge limits and monitoring requirements. With a designed capacity of 579.17 cubic meters per day and an average daily flow of 302.83 cubic meters, the plant operates at approximately 52% of its capacity, indicating room for future growth. The treated effluent is discharged into a local waterway that ultimately drains into the Wolf River basin and then to Lake Michigan via Green Bay. This watershed supports diverse aquatic life and provides recreational opportunities. The plant's secondary treatment helps protect downstream water quality by reducing nutrient loads and organic pollutants before discharge.

The plant discharges into a tributary of the Wolf River, which flows into Green Bay and ultimately Lake Michigan. This watershed supports a variety of fish species and provides habitat for migratory birds. The secondary treatment process reduces biochemical oxygen demand and total suspended solids, helping to maintain the ecological health of the receiving waters and the larger Lake Michigan ecosystem.