If your backflow preventer has not been tested in the last year or two, start there. A certified test will tell you whether the device is still functioning correctly or whether it needs internal parts replaced through a rebuild. In many cases, the answer is both — test first, then rebuild if the results show a problem.
A property manager recently called us after realizing it had been five years since his backflow preventers had been serviced. He was not sure whether they just needed testing or whether a full rebuild was in order. It is a question we hear often, and the honest answer is that you cannot know until someone actually tests the device.
At Workhouse Plumbing & Gas, we handle backflow testing and rebuilds for both residential and commercial properties. Here is how to think through the decision.
What Does a Backflow Preventer Test Actually Check?
A backflow test checks whether the internal check valves and relief valve are holding pressure the way they should. A certified tester connects a differential pressure gauge to the device and runs it through a series of checks. The whole process is hands-on and specific to your device model and size.
If everything passes, you get documentation showing the device is working correctly. If something fails, the test report tells you exactly what failed and why, which is what drives the decision to rebuild.
When Does a Backflow Preventer Need to Be Rebuilt?
A rebuild is needed when internal components like check valve discs, springs, or seats have worn out or are no longer holding a proper seal. These parts degrade over time, especially in commercial settings where the device sees heavy use or sits in a harsh environment.
Common signs that a rebuild may be coming include:
- The device is failing its annual test
- Water is leaking from the relief valve when it should not be
- The device has gone several years without any service
- There is visible corrosion or mineral buildup on the housing
A rebuild replaces the worn internal parts using a manufacturer-approved kit. It restores the device to proper working condition without replacing the entire assembly, which is usually the more cost-effective path.
Can You Test and Rebuild at the Same Time?
Yes, and in many situations that is exactly what we recommend. If a device is several years overdue for service, we will often test it first, then rebuild it on the same visit if the internal components show wear or if it fails any portion of the test.
This saves you from scheduling two separate appointments and gets your system back into compliance faster. Our team will always walk you through what we found and what we recommend before doing any additional work. You can learn more about how we approach this on our about us page.
How Often Should Backflow Preventers Be Tested in Fredericksburg, VA?
Most local water authorities require annual testing for commercial and irrigation backflow preventers. Residential devices may have less frequent requirements depending on the type of device and how your property is classified, but annual testing is still considered best practice.
If you are not sure what your local requirements are, we can help you sort that out. Our backflow prevention services cover both testing and certification, so you stay on the right side of your water authority without the headache of tracking it down yourself.
Frequently Asked Questions
What happens if I skip backflow testing for several years?
The device may still be functioning, but you have no way to know without a test. Skipping testing also puts you at risk of a compliance violation if your water authority or local jurisdiction requires annual certification. Internal parts can also fail silently, meaning contaminated water could potentially flow back into the potable supply without any visible warning.
How long does a backflow test take?
Most tests take between 30 minutes and an hour depending on the number of devices and their accessibility. If a rebuild is also needed, plan for additional time on site. We will give you a realistic picture of the scope once we have eyes on the equipment.
Do I need a certified tester, or can any plumber do it?
Backflow testing must be performed by a certified backflow tester. It is not a standard plumbing task. At Workhouse Plumbing & Gas, our technicians hold the appropriate certifications to test, certify, and rebuild backflow prevention assemblies.
If your backflow preventer is overdue for service, do not wait. Contact us to schedule a test for your property in Fredericksburg, VA or the surrounding area. We will figure out what your device actually needs and take care of it the right way.