Backflow Testing and Installation, Without the Drama.
The water department says your backflow preventer is due for its annual test. Not a crisis, not a shakedown — just a mechanical device that has to prove, once a year, that it still works. We install them, we test them, we file the paperwork. Call or text 405-519-1868.
Match the Notice to the Fix
Backflow problems announce themselves on paper more often than in puddles. Find yours below.
| Symptom | What's actually happening | What we do |
|---|---|---|
| A letter from the water department says your annual backflow test is due | Your device has to be re-certified every year — the springs and rubber inside wear invisibly | Schedule the test, run it, file the results with the city |
| Water is spraying or dripping from a vent on the assembly | The RPZ relief valve is dumping because debris is holding a check disc off its seat | Tear down, clean, rebuild with a new check kit, retest on the spot |
| Water pressure dropped after a new preventer went in | A working RPZ takes a pressure bite by design — or a shutoff valve got left half-closed | Gauge it, confirm whether the drop is design or defect |
| The T&P valve on the water heater started weeping after the backflow install | Your system is now closed — thermal expansion has nowhere to go and pressure can climb past 150 PSI | Add a properly sized expansion tank; see our expansion tank page |
| A failed-test notice arrived with a quote for a full replacement | Most test failures are debris and worn rubber, not a dead assembly | Second opinion: rebuild kit if the brass body is sound, straight answer if it isn't |
| New commercial build can't get water turned on without a device | Cross-connection control is required at the potable supply connection | Size it, install it, test it, file it — done before your inspection date |
Cross-Connections, In Plain English
A cross-connection is any point where your drinking-water piping touches water you would never drink. The irrigation line whose heads sit in fertilized soil. The fire sprinkler riser full of water that has sat in black steel pipe for years. The soda fountain carbonator, the boiler feed loop with treatment chemicals, the chemical dispenser screwed onto the mop sink. Even a garden hose left in a bucket counts.
Water in those lines stays put for one reason: the city main pushes harder than anything pushing back. Two events reverse that. Backsiphonage — pressure collapses on the city side (a main break, a hydrant pulling heavy flow) and water gets sucked backward like soda up a straw. Backpressure — a pump, an elevated tank, or plain thermal expansion on your side out-pushes the main. Either way, whatever was sitting in the cross-connection heads toward the drinking water.
A backflow preventer is the one-way door built for that moment: spring-loaded check valves in a brass body that slam shut the instant flow turns around. That is why code requires cross-connection control devices at potable water supply connections. This is not a rule somebody invented to sell brass.
The Letter From the Water Department Is Not a Shakedown
You run a building. The letter has a deadline, a device serial number you have never looked at, and somewhere near the bottom, the word "termination." It reads like a threat. It's just maintenance with a due date.
A backflow assembly is mechanical — stainless springs, rubber check discs, resilient seats. They wear, and grit fouls them. A check valve that no longer seals looks identical, from the outside, to one that does. The only way to know is to put a gauge on the test cocks and make the device prove itself. The water department answers for everything in its mains — and once water crosses your meter, it can never be allowed back. So every device gets tested every year, by a licensed tester, with the results filed.
Nobody is excited about this — not the city, not you, and honestly, not us. We're just fast at it, and we handle the filing; you unlock the mechanical room.
Fail-and-Replace: When a Test Turns Into a Sales Pitch
Know this move before you sign anything. A tester puts the gauge on, the first check fails — often genuinely, because spring irrigation startup shoved a season of grit onto the disc — and the verdict arrives stapled to a quote for a brand-new assembly plus installation labor.
What that quote doesn't mention: these assemblies are built to be rebuilt. The brass body is good for decades. The parts that wear — springs, discs, rubber seats — come in repair kits that fit in the palm of your hand, and manufacturers like Watts, Febco, and Zurn Wilkins sell those kits for every assembly they make. Repair is the design intent. The biggest scam in plumbing is the full replacement of something that could be repaired easily, and a "failed" backflow assembly is the purest example of it.
How to spot the move: a failed verdict, a replacement quote, and not one word about a rebuild kit. What we do instead: open it, clean it, replace the worn rubber, retest while we're still standing there. And when replacement is the honest answer — freeze-cracked brass is the classic case — we show you the crack before we show you a number.
What We Actually Do: Install, Test, File
Install. We size the assembly to the line — we put a new 1-1/2" backflow preventer in for a local commercial store just recently — and match the device to the hazard. A double check valve assembly covers lower-hazard connections. Where the downstream side carries chemicals, a reduced pressure zone (RPZ) assembly goes in, and placement matters: its relief valve dumps water by design, so it needs an air-gapped drain below it, not a stockroom carpet. Every install gets isolation valves on both sides and clearance to reach the four test cocks.
Test. Gauge on the test cocks. Check valve one has to hold. Check valve two has to hold. On an RPZ, the relief valve has to open at the right point. Under an hour for an accessible device, and your water is only off while the gauge is on.
File. Results go to your water purveyor so your account shows compliant, and you get a copy. No follow-up letters, no second visit.
One more thing we check at every install: a backflow preventer turns your building into a closed system. Heated water now has nowhere to expand, and pressure can climb past 150 PSI — more than the T&P relief valve on the water heater is built to babysit. No expansion tank on the system? We say so at install time, not after the heater starts weeping. Backflow is one piece of the commercial plumbing work we handle for Edmond and OKC buildings — same crew, same straight answers.
Your Backflow Calendar
- Once a year: the certification test. Put it on the same calendar as the fire extinguisher checks and it stops being a surprise.
- Every spring, if you have irrigation: startup pushes a winter's worth of grit downstream. A relief vent that starts spitting the week the sprinklers wake up is almost always a fouled first check.
- Before the first hard freeze: outdoor assemblies and vault installs need draining and insulating. Frozen water splits brass — the one failure no rebuild kit reverses.
- Right after any new install: confirm thermal expansion control. Closed system, no expansion tank, 150+ PSI — that math doesn't care how new the backflow device is.
- The day a failed-test notice arrives: call early — deadlines shrink fast at the end, and a rebuild-and-retest is quick when there's still room on the calendar.
Proof From the Field
"I work in commercial facility maintenance and Gage is great to work with! He's always on time and always gets the job done. Definitely recommend him for any residential/commercial needs!"
"I have had great service with Ultimate Plumbing. They are quick to respond and get the job done. I use them quite often due to running 8 businesses. They do a great job!"
FAQ
Is a backflow preventer really necessary?
Yes — if your building has a cross-connection, code requires a control device at the potable water connection, and the city enforces it with your meter. The device is the only thing standing between an irrigation line full of lawn chemicals and the tap water in your building.
Can I install a backflow preventer myself?
On a commercial property, no — and anywhere else, it's a worse deal than it looks. The assembly has to match the hazard, sit in the correct orientation with clearance to the test cocks, and then pass a certification test and get registered with your water purveyor before the city considers it to exist. Plumbing work for hire in Oklahoma requires a state license; ours is #190465.
How much does a backflow cost to install?
It depends on four things, and anyone quoting a flat price before seeing your building is guessing. Line size drives the assembly cost. An RPZ costs more than a double check and needs a drain sized for its relief discharge. Location matters — mechanical room, below-grade vault, or outdoor enclosure with freeze protection. And if the install closes your system, expansion control joins the scope. We look first, then go over the cost before we touch anything.
What is a cross-connection?
Any point where your drinking-water piping connects to something you'd never drink. Irrigation lines, fire sprinkler risers, boiler feeds, soda fountain carbonators, a chemical dispenser on a mop sink — even a garden hose left sitting in a bucket. When pressure reverses — a main break on the city side, a pump kicking on inside — flow turns around and heads back toward the drinking water.
What happens if I skip my annual backflow test?
The water department's enforcement tool is the meter, and they will eventually use it. Notices escalate, deadlines shrink, and a device with no current test on file can end in interrupted water service. For a commercial building, that means the doors close.
Why is water spraying out of my backflow preventer?
If it's an RPZ assembly, that vent is the relief valve doing its job — it dumps water on purpose when one of the internal checks isn't sealing. The usual cause is grit on the first check disc. Most of the time the fix is a tear-down, a cleaning, and a fresh rubber kit — not a new assembly.
How long does a backflow test take?
Usually under an hour for an accessible device. We isolate the assembly, hang a calibrated differential pressure gauge on the test cocks, verify both check valves hold and the relief valve opens where it should, then put it back in service. The filing is on us.
Do lawn sprinkler systems need a backflow preventer?
Yes. An irrigation system is the textbook cross-connection: the heads sit in soil loaded with fertilizer, herbicide, and whatever the neighborhood dogs contributed. A pressure drop on the city side can siphon it straight back toward your tap. That's why code puts a device on every irrigation tie-in, on the same annual test list as the big commercial assemblies.
One Call Handles the Whole Cycle
We install the assembly if you don't have one, test it if you do, rebuild it if it fails, and file the results either way. You go back to running the building; the city gets its paperwork; the water keeps flowing in exactly one direction. Call or text 405-519-1868.