Yes — Done’s licensed plumbers repair and replace backflow preventers, pressure vacuum breakers (PVBs), and double-check assemblies on residential irrigation systems, indoor sprinkler connections, and main water supply lines. Backflow prevention work requires specific testing and certification in Colorado, and Done’s plumbers meet those requirements. If your backflow device is leaking, failing its annual test, or needs to be replaced after winterization damage, we can handle the full scope.

What a Backflow Preventer Does and Why It Matters

A backflow preventer is a one-way valve assembly that stops non-potable water from flowing backward into the clean municipal water supply. Without it, a drop in water pressure — from a main break, a fire hydrant being opened nearby, or heavy draw elsewhere on the street — can create enough suction to pull irrigation water, fertilizer, or other contaminants back through your hose bib or irrigation connection and into the drinking water supply.

Colorado has mandatory backflow prevention requirements for irrigation systems, and most Front Range municipalities require an annual test by a certified tester. Failures are reported to the water utility, which can require corrective action within a specified window. Done can perform the repair or replacement needed to bring a failing device back into compliance.

Common Backflow Preventer Problems in Colorado

The Front Range climate creates specific failure patterns:

  • Freeze damage: PVBs mounted on exterior walls or above-ground irrigation connections are highly vulnerable to our hard freezes. A single overnight freeze with water still in the device can crack the bonnet, split the body, or fracture the internal check assembly
  • Worn poppet valves or seats: The internal rubber seats and spring-loaded check valves wear over years of cycling; the device drips continuously or fails its test when the seat can no longer seal
  • Mineral scale buildup: Colorado’s hard water deposits calcium on the internal seat surfaces, preventing a clean shutoff
  • Cover or bonnet damage: Hail, UV degradation, and physical impact (lawn equipment, irrigation startup) can crack the external housing
  • Test cock leaks: The small test ports on the device body develop drips as their internal O-rings age

Repair vs. Replacement

Whether a backflow preventer can be repaired or needs full replacement depends on the device type and the nature of the failure. PVBs are relatively inexpensive assemblies, and when freeze damage has cracked the body, replacement is almost always more cost-effective than sourcing a manufacturer repair kit for a compromised housing. For more substantial assemblies — reduced-pressure zone (RPZ) devices on commercial-adjacent or high-hazard residential connections — internal rebuild kits are available and repair is often cost-justified.

Done will tell you honestly which path makes sense. We’ll also note whether the replacement device needs to be tested and logged with your water utility, and we handle that coordination when required.

Winterization and Freeze Prevention Going Forward

Most backflow preventer freeze damage is preventable. PVBs should be insulated with a foam cover designed for the device size through the winter months, and the irrigation system should be properly blown out with compressed air each fall before the first hard freeze — typically mid-October in the Denver metro, though cold snaps can arrive earlier along the Front Range. Done offers irrigation winterization services, and our team confirms the backflow device is properly drained and protected before the season ends.

Schedule Backflow Service

A leaking or failed backflow preventer isn’t just a nuisance — it’s a compliance issue with your water utility and a genuine contamination risk. Don’t put off the repair. Visit our pressure and backflow service page to schedule an inspection and repair, or explore our full range of plumbing services if you have related work to address at the same time. Financing options are available if you’re combining backflow repair with irrigation system upgrades or other plumbing work.