Backflow Testing Bay Area
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Repair Service

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.

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All Major Brands
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Emergency Service
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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.

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Why Devices Fail

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.

How We Fix It

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.

1

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.

2

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.

3

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.

4

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.

Making The Right Call

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.

Factor
Repair
Replacement
Cost
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.
Time
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.
Longevity
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.
When to Choose
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.

FAQ

Frequently Asked Questions

In most cases, we can diagnose and repair a failed device in the same visit — typically 1 to 2 hours. We carry common rebuild kits, gaskets, springs, and seals for all major brands on our service trucks. If the repair requires a specialty part we do not have on hand, we can usually source it and return within 24 to 48 hours.
Repair costs typically range from $150 to $450 depending on the type of device, the extent of the damage, and the parts required. A standard gasket and spring replacement on a residential double check valve is on the lower end. A full internal rebuild of a commercial reduced pressure zone assembly is on the higher end. We always provide a firm quote before beginning any work.
Yes. We repair Watts, Febco, Wilkins, Apollo, Conbraco, Ames, and all other common brands. We use OEM-quality rebuild kits specific to each manufacturer and model. Our technicians are trained and certified on all major backflow prevention device types — RPZ, DCVA, PVB, and SVB.
Yes, the water supply to your property will need to be temporarily shut off during the repair. For residential properties, this usually takes 30 to 60 minutes. For commercial properties with multiple devices or isolation valves, we can often shut off only the branch being repaired so the rest of the property stays operational.
Absolutely. All our repairs come with a 90-day workmanship warranty. If the device fails its next certification test due to a defect in our repair work within that period, we will re-repair it at no charge. OEM parts may have their own manufacturer warranty as well. We also guarantee the device will pass its immediate re-certification test after the repair is complete.
If upon inspection we determine that the device is beyond repair — due to a cracked body, severe corrosion, freeze damage, or age — we will clearly explain why and recommend replacement. We carry common replacement devices on our trucks and can often complete the replacement and certification in the same visit.
For most residential repairs, you do not need to be home as long as the device is accessible from outside the house — which most backflow devices are. We will need access to shut off the main water valve, which is usually at the front of the property. We coordinate by phone and provide before-and-after documentation so you know exactly what was done.

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.

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