Wastewater Treatment Division

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 1.5 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.

Reporting and viewing problems

• Sewer construction issues, sewage spill response, and odor complaints
• Combined sewer overflow (CSO) status in Seattle area 
• Locating sewer pipes and other utilities ('811' One Call, external link)

Doing business with WTD

• Capacity charge online payment
• Sewer rate and capacity charge
• Industrial wastewater discharge approvals
• Requesting engineering design standards
• more...

Learning about projects (under construction or in planning)

• Ballard Siphon replacement, Seattle 
• Barton Pump Station upgrade, Seattle 
• Brightwater treatment system, North King County/South Snohomish County
• Fremont Siphon, Seattle
• Interbay Pump Station, Seattle
• Kent-Auburn conveyance system improvements, South King County 
• Kirkland Pump Station and sewer upgrade
• North Creek Interceptor, Bothell
• Puget Sound Beach CSO Control, Seattle
  • North Beach 
  • South Magnolia 
  • West Seattle (Barton and Murray)
• Additional projects
• Of interest: Regional Wastewater Services Plan

Getting involved in protecting the environment--citizen action

• Attend an upcoming plant tour
• Things you can do to protect the environment
• Let's talk trash
• Use biosolids compost as a mulch and soil conditioner on home gardens and lawns
• Be aware of emerging issues that affect our environment (EDCs, Pharmaceuticals)
• Climate change - what you can do