Duvall WWTP - Wastewater Treatment Plant in Duvall, Washington

Duvall WWTP is a municipal wastewater treatment facility located in Duvall, Washington, serving a population of about 6,715. The plant is situated in King County, within the Snoqualmie River watershed, and plays a key role in managing local wastewater for this growing community. As a plant serving a small to medium agglomeration, Duvall WWTP is subject to the U.S. Clean Water Act and state-level regulations administered by the Washington Department of Ecology. These regulations require secondary treatment as a baseline, with additional nutrient removal in sensitive areas. The plant's designed capacity is 1.00 million gallons per day, indicating it is sized for the current population. The treated effluent from Duvall WWTP is discharged into the Snoqualmie River, which flows into the Snohomish River and eventually reaches Puget Sound. This river system supports diverse aquatic life, including salmon runs, and the plant's operations are critical to maintaining water quality in this ecologically important watershed.

Duvall WWTP discharges into the Snoqualmie River, a key tributary of the Snohomish River, which flows into Puget Sound. The watershed supports critical salmon habitat and diverse aquatic ecosystems. The plant's operations help protect downstream water quality in this sensitive riverine environment.