Backflow Assembly Testing

Submitting Test Reports and Certification Documents

Submit reports that are completed in accordance with our guidelines and contain all the information required by the Washington Administrative Code (WAC) 246-292-036. If you have questions about your backflow assemblies or Seattle’s testing requirements, please contact us at SPU_Backflow@Seattle.gov or (206) 684-3536.

To submit test reports or certification documents, please follow the instructions below:

• For Test Reports and Certification Documents:
  • Email: SPU_TestReports@Seattle.gov
  • What to send:
    • Completed test reports
    • Updates for Backflow Assembly Tester (BAT) Card & Test Kit Certificates of Calibration
    • New tester and test kit information (clearly mention if it’s new or an update)
• For Questions or Compliance Issues (Non-Test Report or Certification):
  • Email: SPU_Backflow@Seattle.gov
  • What to send:
    • Any questions or issues not related to test reports or certifications

View or download SPU’s assembly test report form: Backflow Preventer Inspection and Field Test Report (PDF)

Testing Compliance Questions & Answers

Why do I have to test my backflow assembly every year?

Backflow prevention assemblies are installed to protect your drinking water from potential contamination sources. The only way to ensure that they are functioning properly is through annual testing by a certified Backflow Assembly Tester. Testing is also required by Washington State law.

Who can test backflow assemblies?

All backflow prevention assemblies must be tested by a State of Washington Certified Backflow Assembly Tester. There are numerous certified testers in the area who follow the same testing procedures. You can contact several testers to find one that fits your pricing and scheduling needs. Certified testers are listed by Washington Certification Services.

Note: The tester is responsible for providing Seattle Public Utilities with copies of their current state certification and test equipment calibration certificates. Test reports cannot be submitted without this information in our system.

What should I do after my backflow is tested?

After your backflow assembly has been tested by a certified Backflow Assembly Tester (BAT), the tester will submit the test report directly to Seattle Public Utilities. Please work with your tester/testing company to ensure that they provide you with documentation, for your records, that confirms your test results have been submitted.

I have my backflow assembly tested every year as required, but my neighbor says that they have never heard of the testing requirement.

There could be several reasons why your neighbor hasn’t received test due notices. The most common reason is that Seattle Public Utilities may not know about the installation of the backflow device. Sometimes customers modify their water systems without having them inspected, or their device may not require testing. There are specific requirements for non-testable devices, which makes them impractical for many customers.

What happens if I don't test my backflow prevention assembly?

It’s essential to test your backflow prevention assemblies annually to ensure they function correctly. Failure to do so increases the risk of contamination to your drinking water.

Seattle Public Utilities sends out reminders about testing requirements, but it is the water service owner’s responsibility to ensure the assemblies are tested on time. If testing is not completed, Seattle Public Utilities may assess non-compliance charges and possibly terminate water service. SPU will work with customers to avoid these actions. For questions about regulatory enforcement or backflow assemblies, contact us at SPU_Backflow@Seattle.gov or (206) 684-3536.