How Do I Interpret the Test Results from Backflow Testing?

Backflow testing is an essential process that ensures your backflow prevention device is functioning properly and protecting your water supply from contamination.

Once the test is complete, you’ll receive a report detailing the results—but for many property owners, interpreting those results can be confusing.

Understanding your backflow test results is key to taking the appropriate next steps. Let’s break down how to interpret backflow test reports so you can stay compliant and ensure your water system is safe.

What Is Backflow Testing?

Backflow testing evaluates the performance of your backflow prevention assembly, which is designed to stop contaminated water from flowing back into clean water systems.

A certified Long Beach backflow tester checks the device for proper operation, ensuring valves, seals, and other components are working as intended. The test is typically required annually by local water authorities to maintain the safety of the public water supply.

Key Components of a Backflow Test Report

When you receive your backflow test results, the report will include several key pieces of information. Here’s what to look for:

1. Device Information

   • Type of Device: The report will list the type of backflow prevention assembly (e.g., double-check valve assembly, reduced pressure zone assembly, or pressure vacuum breaker).

   • Location: It identifies where the device is installed on your property, usually tied to a specific water line or system.

   • Serial Number: Each device has a unique serial number for identification purposes.

2. Test Results

   • Pass or Fail Status: The most important section of the report will show whether your device passed or failed the test.

   • Pressure Readings: For devices like reduced pressure zone assemblies (RPZs), the tester will measure pressure levels in the device to ensure proper operation. Key measurements include:

     • Relief Valve Opening Point: This measures the pressure at which the relief valve activates to prevent backflow.

     • Check Valves: This ensures that the check valves maintain adequate pressure to block backflow.

3. Reasons for Failure (if applicable)

   
   

   If your device fails the test, the report will outline the specific issue. Common reasons include:

   • Leaking check valves or relief valves

   • Debris buildup in the assembly

   • Worn-out seals or gaskets

   • Improper installation

4. Recommendations

   • If the device fails, the report will often include recommendations for repairs or replacements needed to bring the assembly up to standard.

5. Tester Information

   • The report will include the name, certification number, and contact information of the certified tester who conducted the inspection.

How to Interpret the Results

1. Passed Test

   
   

   If your device passes the test, congratulations! This means your backflow prevention assembly is working correctly and meets all regulatory requirements. You’ll need to submit the test results to your local water authority as proof of compliance.

2. Failed Test

   
   

   If your device fails, don’t panic. A failed test simply means the assembly needs maintenance or repair to function properly. Review the identified issues in the report and consult with a certified backflow repair technician to address the problem. Once the repairs are made, the device will need to be retested.

3. Pressure Readings and Thresholds

   
   

   Pay close attention to the pressure readings in the report. For example:

   • For RPZ assemblies, the relief valve should open at a specified pressure threshold (typically above 2 PSI).

   • Check valves must meet minimum pressure requirements to prevent backflow. If the readings are below acceptable levels, the device may need repairs.

What to Do After Receiving the Results

• Submit the Report: In most jurisdictions, you are required to submit the results to your local water authority within a specified timeframe.

• Schedule Repairs (if needed): If your device fails, act quickly to schedule repairs and retesting to avoid non-compliance penalties.

• Plan for Future Testing: Mark your calendar for the next required test, typically one year from the current test date.

Conclusion

Interpreting backflow test results doesn’t have to be complicated. Focus on the pass/fail status, pressure readings, and any recommended repairs outlined in the report. A passing result means your water system is safe, while a failing result requires prompt action to restore compliance.

By understanding the details of your backflow test report, you can keep your water system functioning properly and ensure the safety of your property and the community.