Carnation Treatment Wastewater Plant | Carnation, Washington

Carnation Treatment is a municipal wastewater facility located in Carnation, Washington, serving a population of approximately 1,780 residents. The plant is situated in King County, within the Snoqualmie River watershed, and plays a key role in managing local wastewater for this small community. As a small-scale facility, Carnation Treatment is subject to the U.S. Clean Water Act and Washington State Department of Ecology regulations. Plants of this size typically employ secondary treatment or equivalent to meet National Pollutant Discharge Elimination System (NPDES) permit requirements. The designed capacity is 1.00 million gallons per day, indicating the plant is sized for the community's needs. The plant's treated effluent is discharged into the Snoqualmie River, which flows into the Snohomish River and eventually reaches Puget Sound. This watershed supports diverse aquatic life, including salmon runs, and the plant's operations are critical to maintaining water quality in this ecologically sensitive river system.

Carnation Treatment discharges into the Snoqualmie River, a key tributary of the Snohomish River, which drains into Puget Sound. The Snoqualmie watershed supports critical salmonid habitats, including Chinook salmon and steelhead trout. The plant's effluent quality directly affects these species and the overall health of the downstream estuary.