There is a slight increase in 2026 to the base rate and some of our fees.
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King County Water District #90
15606 SE 128th Street
Renton, WA 98059
425-255-9600 Office
Contact via E-mail
15606 SE 128th Street
Renton, WA 98059
425-255-9600 Office
Contact via E-mail
Open 7:30am - 5:00pm Monday - Thursday & CLOSED FRIDAYS
District's 2026 Schedule of Charges Posted
There is a slight increase in 2026 to the base rate and some of our fees.
Do You Have a Backflow Device?
KCWD90 has partnered with Backflow Solutions, Inc. (BSI), a third-party contractor, to manage the District's Cross Connection Control Program. BSI provides a web-based tracking program and a more efficient and cost-effective means of managing the District's inventory of backflow prevention assemblies.
What does this mean for you as a backflow customer? Click here to find out.
Here to Serve Our Entire Community
Clean water is essential to the pursuit of health and happiness and King County Water District No. 90 exists to provide these services to everyone in our community. We serve a diverse population and we want to communicate to you, our customers, that we support equality.
Read Our Full StatementWelcome to King County Water District #90!
Recent District News
District's 2026 Schedule of Charges Posted
1/14/2026
Future Annexation - May Valley Road Extension
10/13/2025
Efforts are underway to potentially extend service to the May Valley Road area. To learn more about it, click here Future Annexation - May Valley Road
Well & Water Treatment Plant Project 6/4/2025
6/9/2025
For more information on our Well and Water Treatment Plant Project currently underway, click here: https://www.kcwd90.com/forms/001080.pdf
FLOURIDE IN YOUR WATER
4/30/2025
Four Creeks Consolidation Study
2/22/2022
The Four Creeks Ranch Water System (FCR) (DOH ID# 22740-4) is a privately owned, Community Group A water system located in unincorporated King County, just south of Issaquah and east of the Renton