Backflow Preventer Replacement Service

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Licensed, Bonded & Insured 4.9 Stars Same-Day Service Upfront Pricing

Backflow preventer replacement removes corroded device bodies, discontinued models with no available parts, and assemblies that have failed multiple consecutive tests despite rebuild attempts — installing a new unit that meets current state building code and local utility specifications. Bonded Plumbworks’ BPAT-certified technicians review test history before cutting out the old device, install the replacement, immediately perform differential pressure testing to confirm passing readings, and submit results to your water utility on the same visit.

Backflow preventer replacement is the removal of an existing backflow prevention assembly and installation of a new device of the same or upgraded type at the code-required location. Replacement includes disconnection of the old device, installation of the new assembly with proper pipe connections, initial testing, and re-registration with the local water utility. — Bonded Plumbworks

What Is Backflow Preventer Replacement

Backflow preventer replacement involves removing the old device from the supply piping, evaluating whether the existing piping and installation location still meet current code, installing a new device with appropriate union connections for future serviceability, testing the new device with calibrated gauges, and registering the new serial number with the water utility.

Replacement is distinct from repair in that the entire device body — housing, check valve modules, test cocks, and relief valve (on RPZ units) — is replaced rather than rebuilt with internal components only. This is necessary when the brass or stainless steel body has developed through-wall corrosion, when internal bore surfaces are too scored for new seals to function, or when the device model has been discontinued and parts are no longer manufactured.

Backflow preventer bodies are typically constructed from lead-free brass (post-2014 due to the Safe Drinking Water Act) or stainless steel. Over 15 to 25 years, mineral scale, galvanic corrosion, and pressure cycling degrade the body bore, making reliable sealing impossible even with new internal components. At this stage, replacement is the only reliable option. — Bonded Plumbworks, serving since 2006

When to Schedule Backflow Preventer Replacement

Backflow preventer replacement is warranted when consecutive tests fail despite rebuilding, when the body shows through-wall corrosion, and when rebuild kits are discontinued or leaded brass is found.

• Your backflow device has failed consecutive annual tests despite being rebuilt
• The device body shows visible corrosion, pitting, or through-wall deterioration
• The model is discontinued and manufacturer rebuild kits are no longer available
• Your utility requires an upgrade from a lower-protection device to a higher-protection device (e.g., DCVA to RPZ)
• The device predates 2014 and contains leaded brass, which no longer meets Safe Drinking Water Act requirements
• The device was installed at an incorrect height or location and must be relocated
• Damage from physical impact, vehicle contact, or freeze event has cracked the body

How It Works

Step 1: Assessment. We inspect the existing device, review its test history, and confirm that replacement (rather than repair) is the appropriate course. We determine whether the replacement device should be the same type or whether a code or utility change requires an upgrade. Backflow Preventer Replacement inspection gives you a live view of the problem before any work starts. You review the findings and approve the quote before any repair begins.

Step 2: Device Selection. We select a replacement device that matches the pipe size, connection type, and protection level required. For RPZ replacements, we verify that adequate drainage exists at the installation location. We stock common residential sizes (3/4-inch and 1-inch) from Watts, Wilkins-Zurn, and Febco for same-day service.

Step 3: Removal. We shut off the upstream water supply, drain the existing device, disconnect it from the piping at the union connections (or cut the pipe if union connections were not installed previously), and remove the old device.

Step 4: Installation. We install the new device with proper union connections on both sides for future serviceability, ensuring correct orientation (flow direction arrow matches supply flow), proper height above grade, and accessibility for annual testing. If the original installation lacked unions, we add them during replacement.

Step 5: Testing and Registration. We pressurize the system, perform a certified backflow test with calibrated differential pressure gauges, document passing results, and register the new device serial number with the local water utility.

Union connections on both sides of a backflow preventer are essential for future serviceability. Without unions, every repair or replacement requires cutting and re-soldering the pipe. Bonded Plumbworks installs unions on every backflow preventer — both new installations and replacements — to ensure efficient future maintenance. — Bonded Plumbworks

Benefits vs. Alternatives

When a device requires repair more than two years in a row, replacement is typically more economical over a five-year horizon than continued rebuilds.

Pricing

• PVB replacement (3/4-inch residential): $400 - $700
• DCVA replacement (3/4-inch to 1-inch): $600 - $1,000
• RPZ assembly replacement (3/4-inch to 1-inch): $900 - $1,800
• Pipe modification (if unions need to be added): $100 - $300
• Initial test and utility registration: Included

Pricing includes the device, labor, unions, initial test, and utility paperwork. Bonded Plumbworks provides a written estimate after evaluating the existing installation.

Our Qualifications

Bonded Plumbworks holds BPAT certification and is authorized to install, test, and certify all types of backflow prevention assemblies. Since 2006, we have replaced hundreds of backflow devices, working with all major manufacturers including Watts, Wilkins-Zurn, Febco, and Apollo.

All Bonded Plumbworks backflow preventer replacements are installed per the manufacturer’s specifications and tested with calibrated differential pressure gauges verified annually per AWWA M14 standards. Test results are submitted directly to the local water utility. — Bonded Plumbworks, established 2006

FAQ

How do I know if my backflow preventer needs replacement or just repair? If the device body is corroded, the model is discontinued with no parts, or the device has failed tests in consecutive years despite rebuilds, replacement is recommended. Bonded Plumbworks evaluates both options and recommends the most economical path.

Can I upgrade to a different type of backflow preventer? Yes. If your utility or a code change requires a higher-protection device (such as upgrading from a PVB to an RPZ), we handle the upgrade including any piping modifications and utility re-registration.

How much does backflow preventer replacement cost? Backflow Preventer Replacement typically costs $100 to $1,800 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 replacement work, so you know the exact cost upfront. Call (855) 557-9600 for a same-day quote.

Will I lose water during replacement? The upstream supply is shut off during the swap, typically for 30 to 60 minutes. Your main house water supply is not affected if the backflow device is on an irrigation branch line.

Back to Backflow Prevention

Schedule Your Backflow Preventer Replacement

Replace a failed or obsolete device with a code-compliant assembly. Call Bonded Plumbworks at (855) 557-9600 to schedule backflow preventer replacement. We handle removal, installation, testing, and utility registration. Every backflow preventer replacement service includes a 90-day guarantee on backflow preventer replacement work, covering parts and labor.