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Capacity charge
Information on the sewer treatment capacity charge, how to pay your capacity charge bill, and who to contact if you have questions.
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 local sewer agencies.
About the capacity charge
Learn more about why King County has a capacity charge, how the capacity charge is structured, and who pays the capacity charge.
How to pay your bill
Instructions on how to pay your capacity charge online or by mail.
Need help paying your bill?
Information about flexible payment plans, payment deferrals for low-income seniors and disabled individuals, and discounts for eligible low-income housing residents.
Affordable housing discounts for new development
New low-income housing in multi-family structures, single detached dwelling units, owner-occupied dwelling units, and shelter housing may qualify to receive a discounted capacity charge.
Rate structure reviews
King County periodically reviews its capacity charge rate structure to make sure the capacity charge program accurately reflects current demographics and housing trends.
Rate and affordability study updates
Read past updates on the 2017 capacity charge rate study and Low-Income Customer Affordability Study.