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

Water District #90 Publications Library

Stay current on Water Quality reports, newsletters and our annual report.

May 19, 2021Notice to Backflow Customers

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Notice to Backflow Customers
56 kb • May 19, 2021

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.


  • Notifications will come directly from BSI and will have the device and the name of your last tester listed.
  • A Customer Confirmation Number ("CCN") will be assigned so you. The CCN allows you to access your records and verify the annual test report has been submitted. Customer Portal
  • Annual test compliance is the end of June of every year. 
  • Your certified tester will need to upload the test report with BSI online. There is a fee associated with uploading. 

QUESTIONS? Call or Email: 

BSI Online (800) 414- 4990

KCWD90 (425) 255-9600

April 26, 2018KCWD90 Cross-Connection Control Program per WAC 246 290 490

April 24, 2018Reduced Pressure Backflow Assembly RPBA

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Reduced Pressure Backflow Assembly RPBA
247 kb • April 24, 2018

April 15, 20192019 Backflow Testers

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2019 Backflow Testers
107 kb • April 15, 2019

April 24, 20182018 Backflow FAQ

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2018 Backflow FAQ
97 kb • April 24, 2018

April 24, 20182018 Backflow Test Report

PDF Format
2018 Backflow Test Report
132 kb • April 24, 2018

April 24, 2018Double Check Valve Assembly (DCVA)

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Double Check Valve Assembly (DCVA)
371 kb • April 24, 2018

Do you have or need to have a backflow device? For most customers a DCVA (Double Check Valve Assembly) is exactly what you need. Specifications and details for DCVA installation can be found here.

May 11, 2016List of Approved Backflow Prevention Assemblies

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