King County Water District #90
15606 SE 128th Street
Renton, WA 98059
425-255-9600 Office
Contact via E-mail
Open 8:00am - 4:30pm Monday - Friday

Technical Specifications

Developers and property owners, proposing a water main extension, must install the system expansion in accordance with plans and specifications approved by the District Engineer, and in accordance with the standards and conditions for constructing extensions to the water system adopted by the Board of Commissioners of the District. The Technical Specifications found here detail various types of installations that may be necessary to expand the District's existing system. If you have questions please contact the District office at

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