Backflow Testing in Fort Worth: When It Is Required and How It Works

Backflow testing confirms that the backflow preventer on your sprinkler system still does its job of keeping irrigation water out of the drinking water supply. Fort Worth has specific rules about when testing is required and who may do it. This article explains those rules, what the test involves and what happens if an assembly fails.

Why Testing Is Required

A backflow preventer has internal check valves, springs and seals. Over time, debris, wear, freezes and mineral buildup can keep them from sealing. The assembly may still let water flow normally, so you would not notice a problem from the lawn. A test with calibrated gauges is the only way to know it is working. Our backflow preventer guide explains what the assembly does.

When Fort Worth Requires a Test

Under Fort Worth’s backflow and cross-connection program:

• At installation. Every new backflow assembly on an irrigation system must be tested before the city inspection.
• After repair. Any repair to an assembly must be followed by a test.
• After relocation or replacement. Moving or replacing an assembly requires a permit and a test.
• Every year for commercial irrigation. Commercial class irrigation assemblies must be tested annually. The city also requires annual testing of rain and freeze sensors on commercial systems.

For residential systems, the city’s rules focus on testing at installation, repair, relocation and replacement. If you are not sure whether your property has additional requirements, the Fort Worth water utility’s backflow program can tell you.

Who Can Perform the Test

Fort Worth requires testing by a licensed Backflow Prevention Assembly Tester registered with the city’s water utility. The tester submits results through the city’s online reporting system. A homeowner cannot test and certify their own assembly.

What Happens During a Test

The details vary by assembly type, but a typical test looks like this:

1. The tester checks the assembly type, size and serial number and notes them.
2. The downstream shutoff valve is closed.
3. The tester connects a calibrated gauge kit to the test cocks.
4. Each check valve is tested to confirm it holds a pressure difference and does not leak backward.
5. For some assembly types, the relief valve or air inlet is also tested.
6. The tester records the readings, reopens the valves and restores normal flow.
7. The results are submitted to the city.

The sprinkler system is shut off for a short time during the test. Water to the house is not usually affected, since the assembly only serves the irrigation line.

If the Assembly Fails

A failed test means one or more parts inside are not sealing properly. Common causes include debris on a check valve seat, worn rubber parts, weak springs or freeze damage. Options include:

• Cleaning and rebuilding the assembly with repair kit parts
• Replacing the assembly if the body is cracked or parts are not available

After any repair, the assembly must be retested. Replacement requires a plumbing backflow permit. Our article on a leaking backflow preventer covers the most common failures.

Preparing for a Test

• Make sure the assembly is easy to reach. Trim back shrubs and clear mulch.
• Let the tester know if the system has been winterized or the valves are closed.
• Have any past test reports handy if you have them.
• Open or remove any cage or cover ahead of time.

Testing and Remodeling

If you are adding a patio, pool, room addition or new landscaping near the backflow preventer, the assembly may need to be moved. Relocation requires a permit and a new test. Plan for it early so the project is not held up.

Testing After a Freeze

If your backflow preventer was exposed during a hard freeze, look for cracks or leaks when you turn the system back on. Internal damage may not be visible. If the assembly was repaired after a freeze, testing is required. Our articles on protecting your backflow preventer from freezing and freeze damage after a hard freeze cover what to check.

What the Test Does Not Cover

A backflow test only checks the assembly. It does not check heads, valves, pipe or the controller. A full system check is a separate step. Many homeowners schedule both together once a year. Our zone-by-zone system check covers the rest of the system.

Keeping Your Own Records

Keep a copy of every backflow test report for your property, along with any repair receipts. The report lists the assembly type, size, serial number, test date, readings and the tester’s information. If you sell the house, the buyer may ask for it. If the assembly fails later, knowing when it was last tested and repaired helps a technician decide whether a rebuild or replacement makes more sense. A folder with your zone map and these reports covers most of what anyone will need to know about the system.

A Test Is Not a Repair

A passing test means the assembly worked on the day of the test. It does not mean it will stay that way. Freezes, debris after a main break and simple wear can change that. If you notice drips, spraying or pressure changes at the assembly, have it checked, even if it passed a test recently.

When to Call a Technician

If your assembly needs repair or replacement, or you are adding or changing an irrigation system and need backflow work done, our sprinkler repair team can help coordinate the repair, permit and required testing.