COLBY WWTP - Advanced Wastewater Treatment in Colby, Wisconsin

COLBY WWTP is a municipal wastewater treatment plant located on West Monroe Street in Colby, Clark County, Wisconsin. The facility serves a population of approximately 1,690 residents, placing it in the small community category under U.S. EPA guidelines. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 1,514.16 m³/day and an average discharge volume of 715.44 m³/day, the plant operates well within its capacity. As a U.S. facility, it operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permit requirements administered by the Wisconsin Department of Natural Resources. The treated effluent is discharged to a local receiving water body, which ultimately drains into the Mississippi River Basin. The plant plays a key role in protecting downstream water quality in the region's streams and rivers, supporting aquatic life and recreational uses.

The plant discharges into a local waterway that is part of the Mississippi River Basin. This watershed supports diverse aquatic species and provides habitat for fish and wildlife. The advanced treatment helps reduce nutrient loading, which is critical for preventing algal blooms and maintaining water quality in downstream lakes and rivers.