Short answer
If you have a dedicated irrigation connection, a fire sprinkler line or a commercial service in Apache Junction, you almost certainly have a backflow assembly that requires annual testing, and your water provider sets the deadline. The test itself is short — the part most customers are actually paying for is the report being filed on time.
Backflow prevention is the plumbing nobody thinks about until a compliance letter arrives. Its job is to stop water flowing backward from your irrigation, fire line or commercial process back into the drinking water supply — which, given what sits in an irrigation line in an Arizona summer, matters more than it sounds.
If you have an irrigation system with a dedicated connection, a commercial property, a fire sprinkler line, or a well that is cross-connected to a municipal supply, you almost certainly have an assembly that requires annual testing.
We test, repair, replace and file the documentation. The part people actually value is the last one: the test is quick, and chasing paperwork afterward is what makes this annoying.
Backflow test due?
Tested, repaired if it fails, retested and filed — usually in one visit. Ask about multiple assemblies on one property.
When you need us
You got a notice from your water provider
Annual test due, or a previous test was never filed. There is usually a deadline attached.
The assembly is dripping or spitting
A relief valve discharging continuously means an internal check has failed. It will not pass a test in that state.
You just installed or moved irrigation
New connections need an assembly, and it needs testing and certifying before it goes into service.
You bought a commercial property
Existing assemblies transfer with the building, and so does the testing obligation. Worth confirming before a notice arrives.
The assembly looks old or damaged
UV and heat degrade above-ground assemblies here. Cracked bodies and seized shutoffs are common after a decade in the sun.
A test failed and nobody fixed it
A failure notice with no follow-up repair is a compliance problem that compounds. We repair and retest in one visit.
What a backflow testing job includes
Every quote covers the items below. If something is not on this list, it is not in the price — and we will say so before we start.
Assembly identified and recorded
Type, make, model, size and serial — everything the test report requires and none of which you should have to look up.
Scheduled around your irrigation
Water downstream is off during the test. On a hot week that matters, so we work around watering days.
Calibrated differential gauge test
Each check valve verified against reverse flow, and the relief valve differential confirmed on a reduced pressure zone assembly.
Repair on the spot where possible
Most failures are rebuildable with a manufacturer kit. Priced and approved before we open anything.
Retested after any repair
So you leave the visit with a pass rather than a pending compliance item and a second appointment.
Report filed with your water provider
Plus a copy for your records. Property managers with several assemblies get everything documented together.
What the assemblies are and how they fail
The two you will encounter most on residential and light commercial property in this area are the pressure vacuum breaker and the reduced pressure zone assembly.
A pressure vacuum breaker protects against back-siphonage — the situation where a pressure drop in the main pulls water backward out of your irrigation. It is the common choice on residential irrigation and it must be installed above the highest point of the system it protects.
A reduced pressure zone assembly is the higher-hazard device, with two independent check valves and a relief valve between them. If either check fails, the relief valve dumps water to atmosphere rather than allowing backflow. That is why a continuously discharging RPZ is not a nuisance leak — it is the device telling you it has failed and doing exactly what it should.
In Arizona, the failure modes are mostly environmental. Hard water scales the check seats so they no longer seal. UV embrittles plastic components on above-ground installations. Debris from irrigation lines lodges in a check. And seized shutoffs on the assembly itself make testing impossible until they are replaced.
Pressure vacuum breaker (PVB)
Common on residential irrigation. Must sit above the highest downstream point.
Reduced pressure zone (RPZ)
Higher hazard applications. Discharges to atmosphere when a check fails — by design.
Double check assembly (DCA)
Used on some fire lines and lower-hazard connections.
Atmospheric vacuum breaker
Simplest device, no shutoffs downstream permitted. Not a testable assembly.
What the annual test involves
Testing is a short procedure with a calibrated differential pressure gauge. We isolate the assembly, connect to the test cocks, and verify each check valve holds against reverse flow and that the relief valve on an RPZ opens at the correct differential.
The whole thing takes well under an hour on an accessible assembly. Water to the downstream system is off during the test, which matters if we are testing an irrigation connection during a hot week — we schedule around watering days where we can.
If it passes, we complete the report and submit it to your water provider. If it fails, we tell you immediately what failed and what the repair costs, and in most cases we can rebuild it on the spot with a repair kit and retest the same visit rather than making you book twice.
Repair or replace
Most failures are rebuildable. Check valve rubber, springs and seats come as manufacturer repair kits, and a rebuild plus retest is considerably cheaper than a new assembly.
Replacement makes sense when the body itself is cracked or corroded, when the assembly is a model with no parts availability, when it was installed incorrectly in the first place — the wrong device for the hazard level, or a PVB mounted below the system it protects — or when repeated rebuilds are no longer holding.
On a replacement we also address the things that shorten assembly life here: a proper protective enclosure against UV and heat, correct height and orientation, and accessible shutoffs so next year's test does not require replacing valves before it can even start.
How a backflow job runs
- 1
Identify the assembly
Type, make, model, size and serial — all of which the test report requires and none of which you should have to look up.
- 2
Schedule around your irrigation
Water downstream is off during the test. On a hot week that matters, so we work around watering days.
- 3
Calibrated test
Differential gauge on the test cocks, each check verified, relief valve differential confirmed on an RPZ.
- 4
Repair on the spot where possible
Failed assemblies are usually rebuildable with a manufacturer kit — priced and approved before we open anything.
- 5
Retest and certify
After any repair the assembly is retested so you leave the visit with a pass, not a pending item.
- 6
File the paperwork
Report submitted to your water provider and a copy to you. This is the part most people are actually paying for.
What drives the price
Testing is a flat fee per assembly. Repairs and replacements are quoted before any work starts.
- Number of assemblies
- Commercial properties with several are priced per assembly at a lower rate when done in one visit.
- Assembly size and type
- A residential PVB and a 2-inch commercial RPZ are different equipment and different time on site.
- Pass or fail
- A pass is just the test fee. A failure adds a rebuild kit and labour, quoted before we proceed.
- Condition of the shutoffs
- Seized shutoff valves on the assembly have to be replaced before testing is even possible. Common on units over a decade old.
- Replacement scope
- A new assembly plus, where needed, a protective enclosure and corrections to height, orientation or accessibility.
Every quote is written, and the number does not change afterward. AZ ROC CR-37 Plumbing · BBB A+ accredited.
Why AllStar Home Services for backflow testing
We will tell you if you do not need a test
A house with no irrigation connection generally has no testable assembly. Tell us your address and what is installed and we will say so rather than sell you a test.
Licensed, insured and permitted
Arizona ROC classification CR-37, issued November 2024, BBB accredited A+. We pull permits and pass the fee through at cost.
The quote is the price
You hear the number before we start and it does not move afterward. It is the single thing customers mention most in our reviews.
Based at 870 W 15th Ave, not a call centre
Shane, Leo and Justin live in Apache Junction. Most of the city is a ten to fifteen minute drive rather than a cross-valley dispatch.
Where we provide backflow testing
Backflow testing follows commercial and irrigation connections rather than housing age. We deliver this from our 15th Ave shop across Apache Junction and Gold Canyon, then out through Queen Creek, San Tan Valley, Mesa, Gilbert, Chandler, Tempe and Fountain Hills.
Further out we cover Florence, Coolidge, Casa Grande, Maricopa, Eloy, Superior and Mammoth, and we are honest about when a small job does not justify the drive. We handle multi-assembly commercial properties across the Apache Junction and Mesa business districts, including the Falcon Field area, and price per assembly at a reduced rate when several are done in one visit.
- Backflow Testing in Apache Junction
- Backflow Testing in Gold Canyon
- Backflow Testing in Queen Creek
- Backflow Testing in Mesa
- Backflow Testing in Superstition Mountain
- Backflow Testing in Ironwood Estates
Backflow Testing questions, answered
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