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Around 1900, Seattle began discharging sewage into Lake Washington. During the 1940s and 1950s, eleven sewage treatment plants were sending state-of-the-art treated water into the lake at a rate of 20 million gallons per day. At the same time, phosphate-based detergents came into wide use.
Before the plant was built, raw sewage flowed directly into the Puget Sound. The visibly polluted water often led to beach closures. [1] Communities surrounding Seattle dumped wastewater into Lake Washington, contaminating it as well. In 1958, voters created the Municipality of Metropolitan Seattle (Metro) to address this problem.
The South Treatment Plant is a wastewater treatment plant in Renton, Washington owned by King County. The plant opened in 1965, and treats over 90 million U.S. gallons (340 million liters) of wastewater per day. It treats sewage for 650,000 people in the cities of Renton, Auburn, Bellevue, Issaquah, Kent, and Sammamish. [1]
A few hours after the leak, the King County Council was told some of the power equipment, which is supposed to keep raw sewage from flowing into water, is from the 1950s and 60s and is prone to ...
The Lake Washington Ship Canal is a canal that runs through the city of Seattle and connects the fresh water body of Lake Washington to the salt water inland sea of Puget Sound. The Hiram M. Chittenden Locks accommodate the approximately 20-foot (6.1 m) difference in water level between Lake Washington and the sound.
Fort Lawton Tunnel/West Point Sewer 15.5 ft (4.7 m) O.D. 8,400 feet (2,600 m) Partial Earth Pressure Balance Machine [1] [5] 1993 Royal Brougham Street Sewer Tunnel 10 ft (3.0 m) O.D. 300 ft (91 m) [1] 1993 Lake Washington Canal Tunnel 3.3 ft (1.0 m) 1,518 ft (463 m) First slurry microtunnel in Seattle [1] 1995 Lander Street Sewer Tunnel
Brightwater is a regional sewage treatment plant in south Snohomish County, Washington, United States. It serves parts of the Seattle metropolitan area and was opened in 2011. The plant construction and associated tunneling were a five-year megaproject costing $1.8 billion. [1]
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