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Please note: the payment system is down for scheduled maintenance every 3rd Sunday of the month, 6:00 a.m. - at 11:30 a.m. PST, and every 3rd and 4th Thursday of the month, 5:00 p.m. - 7:00 p.m. PST.

NOTICE REGARDING PAYMENTS (Effective July 1, 2021)

  • A 2.35% of transaction total ($2.00 minimum) is assessed for all credit card transactions and $1.00 flat-fee for eChecks. Customers participating in the Capacity Charge Low-Income Housing Program are not charged a service fee. You have the option to mail in a check or make a payment through automatic bill payment without any additional fee.
  • In addition to Visa and MasterCard, Discover and American Express are now accepted.

Improved Payment Plan Options

King County Wastewater Treatment Division (WTD) continues to offer relief for capacity charge customers financially impacted by the Covid-19 outbreak.

Payment plans are now more flexible. They allow customers to catch up on late bills through smaller, more frequent payments.

To discuss payment plan options, please contact the Revenue & Accounts Receivable Program at: or by phone at 206-296-1450.

Since 1990, King County has levied a capacity charge on structures with new connections to the sanitary sewer system. This charge is paid in addition to the monthly sewer bill assessed by the local sewer district.

The capacity charge:

  • Helps King County cover the costs of sewer improvements.
  • Supports expansion projects needed to serve new growth.
  • Does not exceed the cost of capital facilities necessary to serve new connections to the sewer system.

Newly connecting customers are directly billed by King County for the capacity charge.

Elected officials, sewer utility representatives and jurisdiction officials were all involved in King County’s decision to implement a capacity charge to ensure that “growth pays for growth."

Capacity charge $68.34

Listed rates are for 1 residential customer equivalent (RCE) per month. Capacity charge rates go into effect for new sewer hook-ups on or after January 1 each year. 

Contact Us

Phone: 206-296-1450

Fax: 206-263-6073