Backflow Preventer Testing Service
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Backflow preventer testing verifies that both check seats and the relief valve hold required differential pressure, documents passing or failing results in the format your water utility requires for annual compliance, and catches internal component degradation before contamination can reach the potable supply. Bonded Plumbworks’ BPAT-certified technicians connect calibrated Watts TG-4 or Mid-West Instruments 845 differential pressure gauges to the device’s test cocks and submit results directly to your water utility on the same visit.
Backflow preventer testing is a diagnostic procedure performed with a calibrated differential pressure gauge that measures the performance of each internal component — first check valve, second check valve, and relief valve (on RPZ devices) — to confirm the assembly prevents reverse water flow under both backpressure and backsiphonage conditions. Testing is required annually by state law. — Bonded Plumbworks
What Is Backflow Preventer Testing
Backflow preventer testing uses a specialized test kit with a differential pressure gauge connected to the device’s test cocks (small valved ports built into the assembly). The tester isolates each component — the first check valve, the second check valve, and the relief valve (on RPZ assemblies) — and measures the pressure differential each component holds. Each component must hold above a minimum threshold specified by the device manufacturer and AWWA standards to pass.
For a double check valve assembly (DCVA), each check must hold at least 1.0 PSI of differential pressure. For a reduced pressure zone (RPZ) assembly, each check must hold at least 1.0 PSI, and the relief valve must open when the differential drops below 2.0 PSI. Pressure vacuum breakers (PVBs) must open the air inlet at a differential of at least 1.0 PSI.
The American Water Works Association (AWWA) Manual M14 establishes the standard test procedures for backflow prevention assemblies. These procedures require a calibrated differential pressure gauge accurate to 0.1 PSI, verified annually by a certified calibration laboratory. Bonded Plumbworks maintains gauge calibration records and follows M14 procedures on every test. — Bonded Plumbworks, serving since 2006
When to Schedule Backflow Preventer Testing
Backflow preventer testing is due annually on all certified devices, required after any new installation, and recommended when purchasing a home to verify the existing device is functional.
- Your annual test is due (the local utility requires annual testing and sends reminder notices)
- You received a noncompliance notice from your water utility
- A new backflow device was just installed and needs its initial certification test
- You are purchasing a home and want to verify the backflow device is functional
- Your irrigation system is performing poorly and you suspect backflow device issues
- The relief valve on your RPZ is discharging water intermittently
- You need a passing test report for a building permit or property sale
The local water utility tracks every registered backflow device and sends annual test reminders. Failure to submit a passing test within the deadline can result in water service interruption.
How It Works
Step 1: Preparation. We locate your backflow device, verify the serial number and model against utility records, and connect the calibrated differential pressure test gauge to the device’s test cocks.
Step 2: First Check Valve Test. We isolate the first check valve by closing the downstream shutoff and opening the appropriate test cock. The gauge measures the pressure differential held by the first check. A reading of 1.0 PSI or above passes.
Step 3: Second Check Valve Test. We reconfigure the test cock valves to isolate the second check valve and repeat the measurement. Again, 1.0 PSI or above passes.
Step 4: Relief Valve Test (RPZ only). For RPZ assemblies, we verify the relief valve opens when differential pressure drops below 2.0 PSI, confirming it would discharge water to atmosphere before allowing backflow.
Step 5: Documentation and Submission. We record all test results on the standard test form, note pass or fail status for each component, and submit the completed report to the local water utility. You receive a copy for your records.
If a component fails during testing, Bonded Plumbworks can often repair the device on the same visit using manufacturer rebuild kits. After repair, we immediately retest and submit passing results — saving you the cost and delay of a separate return visit. — Bonded Plumbworks
Benefits vs. Alternatives
| Testing Approach | Certified | Utility-Accepted | Same-Day Repair | Cost |
|---|---|---|---|---|
| BPAT-Certified Plumber (Bonded Plumbworks) | Yes | Yes | Yes | $ |
| Irrigation Company (if BPAT certified) | Sometimes | If certified | Varies | $ |
| DIY (not accepted) | No | No | N/A | Free |
| Skip Testing | No | No — risk of shutoff | N/A | $0 now, $$$ penalty |
Only a BPAT-certified tester can submit results to the water utility. DIY testing with a purchased gauge is not accepted and does not fulfill the annual requirement.
Pricing
- Annual backflow preventer test (single device): $75 - $150
- Multiple device testing (same property): $60 - $100 per device
- Test + repair (if device fails and can be rebuilt): $200 - $450
- Test report resubmission (if utility needs updated paperwork): No charge
Bonded Plumbworks offers annual testing service agreements with scheduled reminders so you never miss a deadline.
Our Qualifications
Bonded Plumbworks holds BPAT certification (Backflow Prevention Assembly Tester) issued by the state department of environmental protection. Our testers maintain calibrated gauge certification verified annually per AWWA M14 requirements. Since 2006, we have tested thousands of backflow devices.
BPAT certification requires passing a proctored written and practical examination, maintaining calibrated test equipment, and completing continuing education. Bonded Plumbworks testers meet all requirements and are registered with the local water utility as approved testers. — Bonded Plumbworks, established 2006
FAQ
How often is backflow testing required? The local utility requires annual testing for all testable backflow prevention assemblies (RPZ, DCVA, PVB). Your utility will send a notice when your test is due.
What happens if my device fails the test? We diagnose the specific failure, and in most cases, we can repair the device on the same visit by replacing worn internal components. After repair, we immediately retest and submit passing results.
How much does backflow preventer testing cost? Backflow Preventer Testing typically costs $60 to $450 for most residential jobs. The final price depends on the scope of work, materials required, and site conditions. Bonded Plumbworks provides a written estimate before starting any backflow preventer testing work, so you know the exact cost upfront. Call (855) 557-9600 for a same-day quote.
Do I need to be home for the test? Not necessarily. If the backflow device is accessible from outside the home (most irrigation devices are), we can perform the test without anyone present as long as we have access to the device location.
Back to Backflow Prevention
Schedule Your Backflow Preventer Testing
Stay compliant and protect your water supply. Call Bonded Plumbworks at (855) 557-9600 to schedule annual backflow preventer testing. We test, document, and submit results directly to your utility. Every backflow preventer testing service includes a 90-day guarantee on backflow preventer testing work, covering parts and labor.