Backflow Repair
Fast, reliable repair of backflow prevention devices throughout the South Bay. From minor gasket replacements to complete valve rebuilds, our certified technicians get your device passing its test and back in compliance — often same-day.
Failed Your Backflow Test?
A failed backflow test is not the end of the world — it happens more often than you would think. Backflow prevention devices are mechanical assemblies with moving parts, seals, and springs that wear down over time due to water pressure, mineral buildup, temperature changes, and general use.
When your device fails its annual certification test, your water provider will give you a specific timeframe — typically 14 to 30 days — to get it repaired or replaced and re-tested. We specialize in getting your device repaired and re-certified well within that window.
Most repairs are completed in a single visit. Our technicians carry common rebuild kits, gaskets, springs, and seals for all major brands — Watts, Febco, Wilkins, Apollo, Conbraco, and more. In most cases, your device is repaired, tested, and certified the same day.
Signs Your Backflow Preventer Needs Repair
Backflow preventers fail quietly. Long before a device stops protecting your water supply, it usually leaves clues you can spot yourself. If any of these look familiar, it is worth having the assembly inspected before the problem gets worse.
Water Leaking From the Device
Dripping, pooling, or dampness around the assembly is the most obvious sign something has failed inside. Leaks often start at the relief valve or the check valve caps.
Sudden Drop in Water Pressure
If faucets, showers, or irrigation zones fed through the device suddenly run weak, a failing check valve or a clogged internal passage could be restricting flow.
Uneven or Fluctuating Pressure
Pressure that spikes and dips between fixtures, or surges when appliances kick on, points to a device that is no longer regulating flow correctly.
Cloudy or Discolored Water
Brown, yellow, or cloudy water at the tap can mean rust, sediment, or outside contaminants are getting past a worn valve and into your potable supply.
Slow Drainage
Water draining noticeably slower than usual can indicate debris has built up in the assembly or downstream lines, reducing how well the device performs.
Unusual Noises
Banging, humming, rattling, or a constant hiss from the device signals internal parts moving or vibrating when they should be seated and quiet.
Corrosion or Mineral Scale
Green or white crusting, rust streaks, or pitting on a brass body means deterioration has set in. Light buildup can be rebuilt; heavy corrosion usually cannot.
Continuous Relief Valve Discharge
If the relief valve keeps dripping or streaming rather than only during a test cycle, the check valves are not holding and the device needs service right away.
Not sure if you need repair?
Some failures show no physical symptoms at all and only turn up on the annual test. Get in touch if you are dealing with:
- A failed annual test certificate
- Water pooling near the device after testing
- A device that is beyond its certified test date
Common Reasons Devices Fail
Understanding what caused your device to fail helps you know what to expect. Here are the most frequent issues our technicians encounter in the field.
Worn Gaskets & Seals
Rubber gaskets and O-rings degrade over time from water pressure, chlorine, and temperature fluctuations. This is the number one cause of backflow device failure — and the easiest to fix.
Failed Check Springs
The internal springs that hold check valves closed lose tension over years of compression cycles. When springs weaken, the check valve no longer seals properly and the device fails its differential pressure test.
Debris & Sediment Buildup
Dirt, sand, rust particles, and mineral deposits accumulate inside the device body, preventing check valves from fully seating. This is especially common in areas with older water infrastructure or hard water.
Freeze Damage
Devices installed outdoors without proper insulation can freeze during cold snaps. Ice expands inside the assembly, cracking the body, warping internal components, and destroying seals.
Corrosion & Mineral Scale
Hard water minerals and corrosive water chemistry slowly eat away at brass bodies and internal metal components. Severe corrosion may require full replacement rather than repair.
Improper Installation
Devices installed in the wrong orientation, at incorrect heights, or without proper clearances often fail prematurely. We see this frequently with DIY or unlicensed installations and can correct it during repair.
Our Repair Process
A transparent four-step process from diagnosis to re-certification. Most residential repairs are completed in a single visit lasting 1 to 2 hours.
Diagnosis & Quote
Our certified technician arrives at your property, inspects the device, runs a diagnostic test to identify exactly what failed, and provides a repair quote before any work begins.
Disassembly & Cleaning
The device is carefully disassembled. Internal components are cleaned of debris, mineral scale, and corrosion. All worn and damaged parts are identified for replacement.
Parts Replacement & Rebuild
Worn gaskets, seals, O-rings, and springs are replaced with OEM-quality parts. The device is reassembled to manufacturer specifications with proper torque and alignment.
Re-Test & Certification
The repaired device undergoes a full certification test. Once it passes, you receive a new certification report and we file it with your water district. Your device is back in compliance.
Repair vs Replacement
Not every failed device should be repaired. Here is a straightforward comparison to help you make an informed decision — and we will always give you an honest professional recommendation either way.
Typically $150 – $450 depending on parts needed. Most repairs use a standard rebuild kit.
Typically $600 – $1,800+ including the new device, installation labor, and certification.
1 to 2 hours. Most repairs are completed in a single visit with same-day re-certification.
2 to 4 hours. May require a second visit if the new device needs different mounting or plumbing modifications.
Adds 3 to 5 years to the device lifespan. A well-maintained device can last 15+ years with periodic repairs.
New device rated for 15 to 20 years. Comes with manufacturer warranty and zero accumulated wear.
Device is less than 10 years old. Failure is due to gaskets, springs, or debris. No freeze cracks or severe corrosion.
Device is over 15 years old. Body is cracked, corroded, or freeze-damaged. Repair costs exceed 50% of replacement.
Our Recommendation Philosophy
We recommend repair whenever it makes financial and practical sense. If repair costs exceed 50% of a new device, or if the device is too old to justify the investment, we will be upfront and recommend replacement. We stock common replacement devices on our trucks for immediate install if needed.
Frequently Asked Questions
Get Your Backflow Device Fixed Today
Do not let a failed backflow test put your water service at risk. Our certified technicians are ready to diagnose and repair your device — often same-day with immediate re-certification. Serving San Jose, Campbell, Los Gatos, Sunnyvale, Santa Clara, and surrounding South Bay cities.