South Treatment Plant
Wastewater from houses and businesses in the Auburn, Kent, Renton, Bellevue, Issaquah, and Sammamish areas is piped and pumped to the South Treatment Plant for treatment and resource recovery.
There are four treatment plants in the King County East Section Service Area. South Treatment Plant is the lead facility for the Brightwater Treatment Plant in Woodinville, Carnation Treatment Plant, and Vashon Treatment Plant.
Pump stations, also often referred to as lift stations, are responsible for "lifting" the wastewater up and allowing it to flow back into the gravity conveyance system. Some pump stations apply pressure to a conveyance pipe—those sections of pipe are referred to as force mains.
Combined sewer system
A combined sewer system collects stormwater and wastewater in the same pipe. South Plant, Brightwater Plant, and King County's East Service Area are a separated sewer system. More about King County's Combined Sewer Overflow program.
- Side sewers can also be called lateral sewers and are found on private property. These pipelines are the responsibility of the home/property owners and are generally 4–6 inches in diameter.
- Local sewers are managed by cities and water districts. These pipelines move water between private property and the regional sewer system. These pipes are generally between 6 inches and 3 feet in diameter.
- Regional sewers are managed by King County—they collect the water from the cities and water districts and move it to treatment plants for treatment and resource recycling. These pipelines can range from 2 feet to 14 feet in diameter.
Know your sewer system—know who to call. Download this fact sheet and record emergency contact numbers in case of a sewage overflow.
Bellevue Pump Station
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