Who can test backflow prevention assemblies?

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

Show All Answers

1. Why an annual test on the backflow prevention assembly?
2. Who can test backflow prevention assemblies?
3. What will happen if I don't test my backflow prevention assembly?