West Point Treatment Plant, Washington

The West Point Treatment Plant is the largest water treatment plant in the Northwest, processing approximately 90 million gallons of Seattle's sewage per day during the dry months, and as much as 440 million gallons a day during the rain/storm season. Built in 1966 on the edge of Fort Lawton, the plant was upgraded during 1991 and 1996, at a cost of over $500 million. Treated water is ejected into Puget Sound via a 3/4 mile long outfall pipe.