Backflow testing
& installation.
Backflow preventers keep contaminated water out of the drinking supply — and your water provider requires them tested every year. We install, test, repair, and file the paperwork, so compliance is one call, not a project.
Certified backflow services for East Valley businesses.
Backflow happens when a pressure drop in the supply line pulls water backward — and with it, whatever that water has touched. Irrigation chemicals, process water, bacteria: without a working backflow preventer, one main break or fire-hydrant draw can siphon contamination straight into the drinking supply.
That's why municipalities require commercial properties to install backflow prevention assemblies and have them tested annually by a certified tester. OX Plumbing installs, tests, rebuilds, and replaces backflow preventers for restaurants, offices, retail, HOAs, and multi-unit buildings across Mesa and the East Valley.
We track your test dates, show up before the deadline, and file the certification with your water provider — compliance handled, year after year.
Why businesses choose OX for backflow.
Test-and-file service
Repairs on the spot
Deadline tracking
What a maintained backflow assembly protects.
A backflow preventer is a one-way gate for your water. Keeping it certified protects more than the pipe:
Backflow situations we handle.
From a first-time install to a failed test with a deadline attached — we've got it.
Annual test due
Failed inspection notice
New assembly required
Leaking or discharging assembly
Frozen or vandalized units
Irrigation backflow service
Compliance in three steps.
Schedule before the deadline
Test & repair as needed
File & document
One valve stands between your water and everything else.
Cross-connections are everywhere on a commercial property — irrigation, boilers, soda systems, fire lines. The backflow assembly is the single mechanical barrier keeping what's in those systems out of the drinking water, which is why regulators treat a failed or untested assembly as seriously as they do.
The stakes are health, liability, and continuity: contamination incidents make headlines, and non-compliance can end with your water service disconnected. An annual test is cheap insurance against all three.
Commercial compliance, handled quietly.
OX services backflow assemblies across the East Valley's restaurants, offices, salons, and multi-unit properties — the same businesses on our quarterly commercial maintenance routes.
We do the testing, the rebuilds, and the paperwork on schedule, so the only time you think about backflow is when our reminder arrives.
Backflow services we provide.
Every assembly type, every service it will ever need.
Frequently asked questions.
Related services.
Commercial Pump & Control Service
Commercial Leak Detection & Repair
Commercial Emergency Service
Test due — or notice in hand?
Certified backflow testing with same-visit repairs and filed reports. Call now — we answer immediately.