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Sewage Treatment Capacity Charge

Capacity Charge Online Payment
King County
Wastewater Treatment

201 S. Jackson, M.S. KSC-NR-0502
Seattle, WA 98104
Phone: 206-296-1450
Fax: 206-263-6073


Please note: the payment system is down for scheduled maintenance every Saturday from 10 p.m. until as late as Sunday morning at 9 a.m.

On occasion, the system requires maintenance outside this weekly time period. The next scheduled extended maintenance is:

  • Friday, July 21, 5:00 p.m. - Sunday, July 23rd, 9:00 a.m.

During this time, no online payments can be made. We apologize for the inconvenience and appreciate your patience.

Capacity Charge Online Payment   -   Help
Information Use the image below to help you locate the Account Number and the Site Number on the paper invoice you received in the mail.  Enter your numbers into the appropriate boxes, and then click on the Continue button below. 
Account Number    
Site Number    

Sample Invoice   -   Help
Image of sample invoice with Account Number and Site Number circled in red at bottom right