Delafield Hartland WPCC - Wastewater Treatment Plant in Delafield, Wisconsin

Delafield Hartland WPCC is a municipal wastewater treatment facility located in Delafield, Wisconsin, serving a population of about 19,334. The plant is part of the wastewater infrastructure for the Delafield and Hartland communities in Waukesha County. As a U.S. facility, the plant operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Wisconsin Department of Natural Resources. For a population of this scale, secondary treatment is typically required, with possible nutrient removal to protect sensitive water bodies. The plant discharges treated effluent into local streams that flow into the Bark River, a tributary of the Rock River, which ultimately drains to the Mississippi River and the Gulf of Mexico. This connection highlights the plant's role in regional water quality and downstream ecosystem health.

The plant discharges into the Bark River watershed, which flows into the Rock River and then the Mississippi River, eventually reaching the Gulf of Mexico. This downstream chain supports diverse aquatic life and is part of a large river basin that provides habitat for fish and migratory birds. The region's inland location means effluent impacts are primarily on freshwater ecosystems.