Backflow testing confirms that a backflow prevention assembly is working, so contaminated water can't flow back into the public water supply. A certified tester checks the valves and relief settings with a test kit and submits the results to your water utility, which usually requires testing every year.
Call for Same Day Service (833) 763-0420Common assemblies include reduced pressure zone (RPZ) assemblies, double check valve assemblies and pressure vacuum breakers. Your utility specifies which one your connection needs.
If an assembly fails, it's usually repaired by replacing internal parts such as springs, seats or relief valves, then retested.
When You Need Backflow Testing
Most property owners find out they need backflow testing from their water utility, which sends a notice with a deadline. New assemblies also need to be tested when they're installed.
- A testing notice from your water utility
- A new backflow assembly that needs initial certification
- An assembly that failed its last test
- An irrigation or fire sprinkler connection
Types of Backflow Assemblies
- Reduced pressure zone (RPZ) assembly: the highest level of protection, used for high-hazard connections. It has a relief valve that discharges water if it detects backflow.
- Double check valve assembly: 2 check valves in series, used for lower-hazard connections such as many fire sprinkler systems.
- Pressure vacuum breaker: common on irrigation systems, installed above the highest sprinkler head.
Your utility's notice usually lists which assembly you have and where it is.
How a Backflow Test Is Performed
A certified tester attaches a calibrated gauge kit to the assembly's test ports and checks each valve and relief setting. If it passes, the results go to the utility. If it fails, it's repaired and retested.
- Locate and identify the assembly.
- Test it with a calibrated gauge kit.
- Repair it and retest if it fails.
- Submit the results to the water utility.
What Affects the Cost of Backflow Testing
Testing cost depends on the type and number of assemblies, and whether repairs are needed to pass.
- Type of assembly: RPZ, double check or pressure vacuum breaker.
- Number of assemblies on the property.
- Repairs and retest if the assembly fails.
- Filing results with the water utility.
When a Failed Test Needs Fast Repair
- Your utility's deadline is close and service could be suspended.
- An RPZ relief valve is discharging continuously.
Licensed Contractor Rules for Commercial Plumbing
In Memphis, plumbing work, including backflow repairs, must be done by a licensed contractor registered with the Memphis and Shelby County Office of Construction Code Enforcement. Your water utility's notice will say who can test and how results must be submitted.
Local plumbing details: Memphis
Before the Plumber Arrives
- The testing notice from your utility.
- The location of each backflow assembly.
Backflow Testing is one part of commercial plumbing & backflow.
Other Commercial Plumbing & Backflow Services
Backflow Testing Questions
What happens if I miss my backflow test deadline?
Utilities may send reminders and can eventually suspend water service. Check your notice for the deadline.
Do homes need backflow testing?
Many homes with irrigation systems, fire sprinklers or certain other connections do. Your water utility will tell you if yours is required.