Salmon Creek STP 1 - Burien, Washington Wastewater Treatment Plant

Salmon Creek STP 1 is a municipal wastewater treatment plant located in Burien, King County, Washington, United States. It serves a population of approximately 27,126 residents in the Seattle metropolitan area. The plant is situated near the coast of Puget Sound, within 50 km of the shoreline. As a U.S. facility, the plant operates under the National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits and monitoring requirements. For a plant serving over 10,000 people, secondary treatment is typically required under the Clean Water Act. The designed capacity is 1.00 million gallons per day, indicating a medium-scale facility. The treated effluent from Salmon Creek STP 1 likely discharges into a tributary of Puget Sound, a major estuary in the Pacific Northwest. Puget Sound supports diverse marine life, including salmon, orcas, and shellfish. The plant's performance is critical to protecting water quality in this ecologically sensitive water body.

Salmon Creek STP 1 discharges into the Puget Sound watershed, which drains into the Salish Sea and ultimately the Pacific Ocean. Puget Sound is a vital estuarine ecosystem that supports salmon runs, marine mammals, and shellfish beds. The plant's location near the coast means its effluent can directly affect nearshore habitats and recreational waters.