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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.