Every day millions of gallons of wastewater from our region's homes, businesses, and industries is treated here. In 1958 voters in Seattle and King County created Metro, an agency charged with creating a regional wastewater treatment system. In 1966 construction of a primary treatment plant is completed at West Point. In 1991, to comply with the 1972 federal Clean Water Act, Metro begins an expansion of the plant. Expansion and upgrading to secondary treatment is completed in 1996.
King County assumes responsibility for operating the plant.
The Plant The 32-acre treatment plant is located on the shores of Puget Sound next to Discovery Park, Seattle's largest and most natural park. The average daily capacity of the plant is 125 million gallons per day. The plant is designed to address concerns from environmental groups and the neighboring community. Learn more about the innovative design of West Point. The entry to the plant.