Most failed backflow preventers just need cleaning or a new rubber kit. You get the cause and the price before any work, then we retest and file the passing report.
- PriceFree quote
- Time1–2 hours
- RetestIncluded
- ApprovalPrice first
Want to get on the schedule? Call or book online.

When to call for a repair
- Your test failed
- Water drips or gushes from the bottom of the device
- Leaks anywhere on the device
- Your district says it never got a passing report
Some devices can't be saved. When that happens we'll walk you through replacement.
What usually goes wrong
Most backflow repairs in Fontana come down to a short list of causes. Debris from the water main lodges on a check valve seat and keeps it from closing. Rubber discs and o-rings harden and crack with age and heat. Springs weaken. On RP assemblies, the relief valve diaphragm can tear.
All of those are repairable with the right parts. The test readings point to which section failed, so we can go straight to it instead of guessing.
Bigger damage, like a body cracked by freezing or a device hit by a car, is less common. That's when replacement usually makes more sense, and we'll tell you if that's the case.
How repair pricing works
You'll always know the price first. We show you the failed reading, tell you what we think is wrong, and quote the repair. We only start once you approve it.
A typical repair uses a rebuild kit and is done within one to two hours, retest included. If parts need to be ordered, you'll get a timeline and a return appointment.
The retest and the filing with your water district are part of the repair price. There's no extra fee for the report.
Leaks, theft and urgent failures
Some repairs can't wait for a regular appointment. A relief valve dumping water nonstop, a device cracked by a freeze or a stolen assembly leaving a pipe open all need attention right away.
Emergency calls are answered 24/7. Close the shutoff valves on the device, or the main at the meter, and call us. We'll give you a price on the phone and get someone out as quickly as possible.
The same goes for a failed test with a shutoff date coming up. Tell us the date and we'll prioritize the repair so the passing report is filed in time.
Repairs for homes and for businesses
At a home, repairs are usually on a sprinkler device and take an hour or two with the water off. Many are done right after the test, on the same visit.
Businesses need more planning. Fire line devices affect the sprinkler system, and water shutoffs can disrupt customers or patients. We schedule around your hours and keep downtime short.
After a failed test
When a device fails, the district needs a passing report after the repair. We record both the failed result and the passing retest, along with the parts replaced, and submit it.
If your district set a deadline, tell us. We'll make sure the repair and retest are done in time.
Stocked parts and special orders
Our trucks carry rebuild kits, springs, test cocks and common bonnets for the backflow devices we see most often across Fontana. That's why many repairs are done on the same visit as the test.
For less common models or larger fire line assemblies, we order manufacturer parts. Most arrive within a few days, and we'll schedule the return visit as soon as they're in.
Our backflow repair services in Fontana
Backflow Preventer Repair
Repairs for RP, double check, PVB and SVB devices using the manufacturer's parts for your make and model. Leaking relief valves, checks that won't hold, spitting bonnets and worn rubber are the common fixes. Every repair gets a retest and a filed report, and you get the price before we start. More about backflow preventer repair.
Backflow Assembly Repair
Failed test? We go straight to the part the readings point to, clean or rebuild it, and retest before we leave. Most assembly repairs are done in one visit with under an hour of water downtime. You see the price first, and the filing is included. Parts we don't carry usually arrive within a few days. More about backflow assembly repair.
Emergency Backflow Repair
Urgent backflow repairs any time of day or night. Stolen devices, freeze cracks, impact damage and relief valves that won't stop dumping water all get priority. Call 24/7, get the price before dispatch, and we'll fix it, retest it and file the report. Locking cages are available to prevent repeat theft. More about emergency backflow repair.
Questions
What happens if my device fails the test?
We tell you which part failed and why, and give you a price before any work. Most failures are fixed by cleaning or rebuilding the check valves or relief valve with manufacturer parts. After the repair we retest and file the passing report. See backflow repair.
Should I repair or replace a failed backflow preventer?
Repair, most of the time. A rebuild kit fixes the majority of failures. We'd only suggest a new one if the body is cracked, parts aren't available, it was stolen, or your property now needs a different type. More on replacement.
Working with a local backflow company
When you call us about backflow repair, you're talking to a company that focuses on backflow prevention. That focus means we know the devices, the test procedures and what your water district expects to see on the report.
Here's what you can count on: certified testers, calibrated gauges, a price before any work, and filing with your district included. Testing is $105 flat per device under 4 inches and $175 for 4 inches and up. We pick up seven days a week from 6am to 12pm, book most visits within the week and take emergency calls 24/7. Every customer gets a copy of the report for their records.
Backflow Repair in Fontana and nearby
Need backflow Repair outside Fontana? We also cover Rialto, Rancho Cucamonga, Colton, San Bernardino and Ontario. Same-week visits are normal, and booking takes a couple of minutes.