King County, Washington, protects water quality and prevents water pollution by providing wastewater treatment to 17 cities and 17 local sewer utilities. The county's Wastewater Treatment Division serves about 1.6 million people, including most urban areas of King County and parts of south Snohomish County and northeast Pierce County. More about our system and facilities.
As record winter rains transition to an unseasonably warm spring, the community’s celebration of a new rain garden and cistern at Carlton Grocery in Georgetown on April 16 highlighted the many pluses of green stormwater infrastructure. Learn more.
Our regional wastewater treatment system has a big job to do. Not only does it operate around the clock to sustain a healthy environment, this vital infrastructure supports economic development that enables our region to thrive. View Ratepayer Report.
What do you know about jobs related to clean water and sanitation? Watch these short videos and learn about the role of laboratory specialists, operations staff, and maintenance staff in protecting human health and the environment every day.
Start your RainWise project today (external link)! The RainWise program provides rebates that cover most or all of the cost of installing cisterns and rain gardens on your property. To receive a rebate, you must live in an eligible combined sewer overflow basin. Learn more (external link).