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Sewer system services

Find information about the programs and services operated by the King County Wastewater Treatment Division to support the regional wastewater conveyance and treatment system.

Capacity Charge

How to pay your sewer capacity charge bill and who to contact if you have questions.

Combined Sewer Overflow (CSO) Status

Check a map to see if a combined sewer overflow, or CSO, is occurring before going swimming, wading, fishing, or boating near a CSO warning sign. These overflows take place within the City of Seattle.

Industrial Waste

Information about the King County Industrial Waste program and wastewater discharge permits.

Local Public Agency Program

Information about the Local Public Agency Program, including services the program provides such as requests for information and mitigating construction impacts, and additional helpful resources.

Report a problem

We are committed to promptly and swiftly responding to incidents and complaints related to our regional wastewater conveyance and treatment system, such as bad smells coming from the sewer, sewage spills, and other sewer-related issues. 

Septage Disposal

Information about the King County septage disposal facility, including how to get permitted, acceptable wastes, directions, and the septage disposal process. 

Related topics

About the Wastewater Treatment Division

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.

Capital projects

Find information on King County’s current and planned wastewater capital projects, including project descriptions, locations, and status, and sign up for project updates. 

Education and community

King County provides educational experiences for all ages, spaces for community events, and places to enjoy nature.

Resource Recovery

Learn how Resource Recovery provides leadership around sustainability and the reuse of valuable products to support the mission of the Wastewater Treatment Division to protect public health and the environment.

Wastewater programs

Learn about our programs to improve water quality, plan and prepare our wastewater system for regional growth, and protect public health and the environment.

Our treatment facilities

Learn about King County's wastewater and wet weather treatment facilities that protect water quality and public health in the central Puget Sound region.
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