Backflow Testing & Repair

Backflow Prevention Services for Denton County

Backflow prevention is one of the most critical — and most overlooked — aspects of plumbing safety. Backflow occurs when contaminated water reverses direction and flows back into the potable (drinking) water supply, potentially introducing chemicals, bacteria, fertilizers, or other hazardous substances. Municipal water systems throughout Denton County require backflow prevention devices on commercial properties, irrigation systems, and any plumbing connection that could pose a cross-contamination risk.

At Haltex Plumbing, we are certified backflow testers and repair technicians serving Denton, Argyle, Flower Mound, Highland Village, McKinney, Sanger, Krum, and Corinth. We handle annual testing, repair, and installation of all backflow prevention assemblies, and we file the required certification paperwork with your local water utility on your behalf. Our technicians hold the Texas Commission on Environmental Quality (TCEQ) endorsement required for backflow testing in the state of Texas.

What Is Backflow and Why Does It Matter?

Your municipal water system maintains constant pressure to deliver water to your home. If that pressure drops suddenly — due to a water main break, fire hydrant use, or system maintenance — the resulting negative pressure can create a siphon effect that pulls water backward through your plumbing. Without a backflow prevention device, this reverse flow can pull contaminated water from irrigation systems, boilers, chemical mixing stations, or any connected source back into the public water supply.

Backflow events have caused serious public health incidents across the country, which is why Texas plumbing code and local municipal ordinances mandate backflow prevention devices on high-risk connections. The City of Denton, for example, requires annual testing of all installed backflow prevention assemblies and sends notification letters to property owners when testing is due.

Annual Backflow Testing

Texas law requires that all backflow prevention assemblies be tested annually by a TCEQ-endorsed tester. The test verifies that all components of the assembly — check valves, relief valve, shut-off valves — are functioning correctly and preventing backflow. Testing typically takes 15 to 30 minutes per device and produces a pass or fail result that we submit directly to your water utility.

We schedule backflow testing proactively so you never miss a deadline. Many Denton County municipalities send compliance notices with a 30-day testing deadline, and failure to comply can result in water service disconnection. We can usually schedule your test within a few days of your call — or set up annual recurring service so you never have to think about it.

RPZ (Reduced Pressure Zone) Valves

RPZ valves provide the highest level of backflow protection and are required for high-hazard connections — commercial facilities, medical offices, irrigation systems using chemical injection, and any connection where contamination could pose a serious health risk. RPZ assemblies include two independently operating check valves with a pressure-monitored relief valve between them. If either check valve fails, the relief valve opens and discharges water rather than allowing backflow. We install, test, and repair RPZ assemblies from major manufacturers including Watts, Wilkins, and Febco.

Double-Check Valve Assemblies (DCVA)

Double-check valve assemblies provide backflow protection for moderate-hazard connections, such as residential irrigation systems and fire sprinkler connections. They include two independently operating check valves in series. DCVAs are less expensive than RPZ assemblies and are appropriate for applications where the potential contaminant is non-health-hazard (such as non-toxic lawn irrigation). We test, repair, and install DCVA assemblies throughout Denton County.

Backflow Repair & Replacement

When a backflow assembly fails its annual test, repair is needed before the device can be recertified. Common failures include worn rubber components in check valves, stuck relief valves, damaged seats, and debris obstructing valve operation. We carry common repair kits on our trucks and can often repair and recertify a failed assembly in the same visit. If the assembly is too deteriorated for repair, we provide replacement with a new certified device.

When You Need Backflow Service

• Annual testing notice — if your water utility has sent a compliance notice requiring backflow testing, call us to schedule before the deadline to avoid disconnection.
• New irrigation system — any new lawn irrigation connection requires a backflow prevention device and initial certification before the system can be activated.
• Commercial property requirement — restaurants, medical offices, and commercial buildings are required to have backflow prevention on all cross-connections.
• Failed previous test — if your backflow assembly failed testing, repairs and retesting must be completed promptly to maintain compliance.
• Visible leaking — an RPZ relief valve that discharges water constantly or intermittently indicates a failed check valve requiring immediate repair.
• New construction — all new commercial buildings and many residential properties require backflow prevention as part of the plumbing permit process.

Our Backflow Testing Process

Step 1: Locate & Inspect

We locate your backflow prevention assembly (typically near the water meter or irrigation connection), verify the make and model, and visually inspect for damage, corrosion, or leaks.

Step 2: Connect Test Equipment

We attach calibrated differential pressure gauges to the test cocks on the assembly. Our test gauges are certified annually per TCEQ requirements.

Step 3: Perform Test

We systematically test each component of the assembly — first check valve, second check valve, and relief valve (for RPZ assemblies) — measuring pressure differentials against TCEQ-specified pass/fail criteria.

Step 4: Report & File

We provide you with a test report and file the certification directly with your municipality. If the assembly fails, we discuss repair options and can often complete repairs and retest in the same visit.