ELEVA CS Wastewater Treatment Plant, Ettrick, Wisconsin

ELEVA CS is a municipal wastewater treatment facility located in Ettrick, Trempealeau County, Wisconsin, United States. The plant serves a small community of 675 residents and operates under secondary treatment standards, which is the minimum required by the US Clean Water Act for municipal wastewater discharges. The plant's designed capacity is 264.98 units, with an average daily discharge volume of 140.06 units, indicating it operates well below its capacity. As a US facility, 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 water quality. The treated effluent is discharged into a local water body that ultimately drains into the Mississippi River Basin. The plant plays a key role in protecting downstream aquatic ecosystems by reducing organic pollutants and suspended solids before discharge.

The plant discharges into a tributary of the Trempealeau River, which flows into the Mississippi River. This watershed supports diverse aquatic life, including fish and macroinvertebrates, and is part of the larger Upper Mississippi River system. The secondary treatment process helps reduce nutrient loads that could otherwise contribute to algal blooms in downstream waters.