Local sewer agencies served by King County
King County provides wholesale wastewater treatment services to 18 cities, 15 local sewer utilities and the Muckleshoot Indian Tribe in King, Snohomish, and Pierce counties.
These local agencies own and operate independent collection systems, which include pipelines and pump stations to collect and carry wastewater flows in their service area to King County's regional system for treatment and disposal. The local agencies have 30-year agreements with King County for this service. King County owns and operates the regional treatment plants, pipelines, pump stations, and other related facilities.
The county does not bill individual property owners for sewer service. Instead, it charges the local agencies an amount that is based on the county's monthly rate and the number of customers the agency serves. In turn, the local agencies bill their customers to recover the county charge plus the amount needed to operate and maintain their collection systems.
Local sewer agencies served by King County Wastewater Treatment Division
The Metropolitan Water Pollution Abatement Advisory Committee, or MWPAAC, advises the King County Council and Executive on matters related to reducing water pollution. It was created by state law (RCW 35.58.210) and consists of representatives from cities and local sewer utilities that operate sewer systems in King County. Most of these cities and sewer utilities deliver their sewage to King County for treatment and disposal. View MWPAAC meeting schedule.
Regional Water Quality Committee
The King County Council's Regional Water Quality Committee develops, reviews, and recommends countywide policies and plans for water quality and sewer service issues, long-range capital facilities plans, rate policies, and facilities siting to guide regional water quality responsibilities considered by the council.