Eatonville STP - Secondary Wastewater Treatment in Eatonville, Washington

Eatonville STP is a municipal wastewater treatment facility located in Eatonville, Washington, a small town in Pierce County. The plant serves a population of approximately 2,775 residents, providing secondary treatment to meet state and federal standards. As a secondary treatment plant, Eatonville STP uses biological processes to remove organic matter and suspended solids. The plant has a designed capacity of 492.10 volume units and currently treats an average daily flow of 302.83 volume units. It operates under the U.S. Clean Water Act, which requires NPDES permits for discharges to surface waters, ensuring compliance with water quality standards. The treated effluent from Eatonville STP is discharged into a local water body that flows into the Nisqually River watershed, eventually reaching Puget Sound and the Pacific Ocean. This discharge supports the ecological health of the region, which includes salmon-bearing streams and diverse aquatic habitats.

Eatonville STP discharges into a tributary of the Nisqually River, which flows into Puget Sound, an ecologically rich estuary. The Nisqually watershed supports critical salmon runs, including Chinook and coho, and provides habitat for other aquatic species. The plant's secondary treatment helps protect downstream water quality in this sensitive marine environment.