Frequently Asked Questions
Below you will find information that might help you understand how to find things or learn about information you might need to know about your city or town.
Public Works - Cross Connection
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Public Works - Cross Connection
Backflow prevention assemblies are installed to protect our drinking water from potential source of contamination. The Washington State Administrative Code requires testing by a certified Backflow Assembly Tester ( BAT ) to ensure that they are functioning as designed.
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Public Works - Cross Connection
Only a State of Washington certified Backflow Assembly Tester (BAT) can perform the test. Certified testers can be found on websites and in publications such as the yellow pages. An Official listing of certified testers is kept by Washington Certification Services.
Each tester is responsible for providing the City with copies of their current State certification and test equipment calibration certificates. We cannot accept test reports from testers that have not provided this information.View the Forms page for
- Partial List of Local Certified BATs
- COBI Backflow Assembly Test Report Form
- Hold Harmless Agreement
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Public Works - Cross Connection
To ensure that your backflow prevention assemblies are functioning as designed, it is important to the City's water system to have testing performed annually. Failure to test an assembly increases the risk that the assembly will fail to protect our water supply.
The City of Bainbridge Island send out reminder notifications about backflow assembly testing requirements to it's water customers. However, it is the water service customer who is responsible for ensuring that the assemblies are tested on time.