SEQUIM STP Wastewater Treatment Plant, Clallam County, Washington

SEQUIM STP is a municipal wastewater treatment plant located in Clallam County, Washington, United States. The plant serves a population of approximately 6,625 residents and is situated near the Strait of Juan de Fuca, within 50 km of the Pacific coast. As a facility in the United States, SEQUIM STP operates under the Clean Water Act, with National Pollutant Discharge Elimination System (NPDES) permits issued by the Washington State Department of Ecology. The plant has a designed capacity of 1.00 million gallons per day. The plant's discharge ultimately reaches the Strait of Juan de Fuca, which connects to the Pacific Ocean. This coastal environment supports diverse marine life, including salmon runs and orca populations, making effective wastewater treatment critical to maintaining water quality in the region.

SEQUIM STP discharges into the Strait of Juan de Fuca, a major waterway connecting the Puget Sound to the Pacific Ocean. This area supports ecologically significant habitats, including kelp forests and eelgrass beds, which are vital for juvenile salmon and other marine species. The plant's proximity to the coast underscores the importance of proper treatment to protect downstream marine ecosystems.