Enumclaw WWTP - Municipal Wastewater Treatment in Enumclaw, Washington

Enumclaw WWTP is a municipal wastewater treatment facility located in Enumclaw, Washington, serving a population of about 10,920. The plant is situated inland in King County, more than 50 kilometers from the Pacific coast, and treats wastewater from the local community. As a medium-sized agglomeration, the plant is expected to meet secondary treatment standards under the U.S. Clean Water Act, administered through the National Pollutant Discharge Elimination System (NPDES) permitting program. The facility has a designed capacity of 1.00 million gallons per day, indicating it is sized to handle the current service population with some reserve. The treated effluent is discharged into the local watershed, which ultimately drains into the Green River and then to Puget Sound. This downstream environment supports diverse aquatic life, including salmon runs, and the plant's discharge must comply with water quality standards to protect these ecological resources.

The plant discharges into the Green River watershed, which flows into Puget Sound, a major estuarine system in the Pacific Northwest. The receiving waters support critical salmon habitats and diverse marine life, making effluent quality management essential for maintaining ecological health.