Key Takeaways
- Backflow is water flowing backward through your plumbing, pulling contaminants into your drinking water supply.
- The City of Mesquite requires backflow prevention assemblies on irrigation systems under Ordinance No. 3325.
- All backflow assemblies with test ports must be tested upon installation and annually by a licensed tester.
- Mesquite charges a $25 annual inspection fee per assembly, billed on your monthly water statement.
- A licensed plumber registered with the City of Mesquite must install the assembly, and a plumbing permit is required before installation begins.
Backflow prevention keeps contaminated water from reversing direction and entering your home’s drinking water supply. If you have an irrigation system, swimming pool, or even a garden hose connected to a chemical sprayer, the City of Mesquite requires a backflow prevention assembly (BPA) under Ordinance No. 3325. Ignoring this requirement puts your family’s water quality at risk and can result in code enforcement action from the city.
What Is Backflow and Why Does It Matter?
Backflow is the undesirable reversal of water flow in a plumbing system. Instead of water moving from the municipal supply into your home, it flows backward, pulling whatever is in your pipes or connected equipment into the drinking water supply.
Two conditions cause backflow. Back-siphonage occurs when pressure in the city water main drops below the pressure on your side of the meter. This can happen during a water main break, fire hydrant use, or heavy neighborhood demand on a hot summer day. Backpressure happens when the pressure in your plumbing system exceeds the supply pressure, forcing water backward.
In Mesquite, the Texas Commission on Environmental Quality (TCEQ) requires all public water systems to maintain a cross-connection control program. The City of Mesquite enforces this through its Public Works Backflow Inspector and Ordinance No. 3325.
“Most homeowners have no idea they already have a cross-connection in their yard,” says James Armstrong, Master Plumber (License M-39428) and owner of James Armstrong Plumbing. “Every irrigation system connected to your home’s water supply is a cross-connection. If the backflow assembly fails or was never installed, fertilizer, pesticide, and stagnant water from your sprinkler lines can siphon straight into your drinking water.”
What Are Common Cross-Connections in Mesquite Homes?
A cross-connection is any physical link between your potable (drinkable) water supply and a non-potable source. These are more common than most homeowners realize.
Garden hoses are the single most common residential cross-connection. Submerging a hose in a swimming pool to fill it, connecting it to a pesticide sprayer, or leaving the end sitting in a puddle can all create backflow conditions. The TCEQ recommends installing a hose bibb vacuum breaker on every outdoor faucet. These cost under $10 at most hardware stores and screw directly onto the faucet threads.
Irrigation systems create the highest-risk residential cross-connection in Mesquite. Stagnant water in sprinkler lines collects dirt, bacteria, and residue from fertilizers or herbicides applied to the lawn. Without a BPA, this water can enter your home’s drinking supply during a pressure drop.
Swimming pools and hot tubs connected to a fill line without an air gap or BPA are another source. Pool water treated with chlorine, algaecide, and other chemicals is not safe for drinking.
Private wells connected to city water plumbing create a serious cross-connection. Untreated well water can enter the municipal supply and affect your neighbors, not just your household.
What Does Mesquite Require for Backflow Prevention?
The City of Mesquite requires the following under Ordinance No. 3325 and TCEQ regulations.
Installation. All backflow prevention assemblies require a plumbing permit from the City of Mesquite Building Inspection Division before installation begins. A licensed plumber registered with the city must install the assembly. Irrigation system BPAs may also be installed by a licensed irrigator registered with Mesquite.
Testing. All backflow prevention assemblies with test ports must be tested upon installation and annually by a licensed backflow tester. The tester must contact the Mesquite Public Works Backflow Inspector at 972-216-6947 to schedule a testing appointment. The inspector must be present to observe the test.
Annual fee. The City of Mesquite charges a $25 annual inspection fee per assembly. This fee appears on your monthly water bill during the month of your annual inspection. This is separate from any testing charges by the licensed backflow tester.
Documentation. Test results are recorded on TCEQ Form 20700 (Backflow Prevention Assembly Test and Maintenance Report) and submitted to the city.
If your backflow assembly fails its annual test, it must be repaired and retested before it can be returned to service. A failed assembly means your irrigation system is not in compliance with city code.
What Types of Backflow Preventers Do Mesquite Homes Use?
There are three main types of backflow prevention assemblies used in residential plumbing.
Reduced Pressure Zone (RPZ) assembly. This is the highest level of protection. TCEQ requires an RPZ on irrigation systems installed on properties that also have a septic system. RPZ assemblies have two independently operating check valves and a pressure-differential relief valve. They discharge water when a fault is detected, which means they should be installed where drainage is available.
Double Check Valve Assembly (DCVA). Two independently operating check valves provide reliable protection for most residential irrigation systems connected to municipal sewer (not septic). Before 2009, DCVAs were allowed on properties with septic systems, but TCEQ now requires the RPZ upgrade on those properties.
Pressure Vacuum Breaker (PVB). A simpler device often used on smaller irrigation systems. PVBs must be installed at least 12 inches above the highest sprinkler head in the system to function properly.
Hose bibb vacuum breaker. The simplest and least expensive option. These small devices screw onto outdoor faucets and prevent back-siphonage through garden hoses. They do not require annual testing but should be replaced if they crack or leak.
The right assembly depends on your property’s risk level, whether you have a septic system, and the size of your irrigation system. James Armstrong Plumbing evaluates each property individually and recommends the assembly that meets both TCEQ requirements and Mesquite city code.
When Should Mesquite Homeowners Schedule Backflow Testing?
Schedule backflow testing in these situations:
After new installation. Every backflow assembly must be tested immediately after installation before it goes into service.
Annually. Assemblies with test ports require annual testing. The City of Mesquite coordinates inspection timing and bills the $25 fee on your water statement. If you receive a notice from the city, schedule testing promptly to avoid enforcement escalation.
After any repair. If your BPA is repaired or relocated, it must be retested before returning to service.
Before selling your home. A failed or missing BPA can delay closing. Having current test documentation simplifies the home inspection process and shows buyers the plumbing system is code-compliant.
At the start of irrigation season. In Mesquite, most homeowners activate their sprinkler systems in March or April. Testing the BPA before the system runs for the season catches failures before contamination can occur.
Summer is the highest-risk season for backflow events in North Texas. High neighborhood water demand, combined with irrigation systems running daily, creates the pressure fluctuations that trigger back-siphonage. If your irrigation system has been running all summer without a functional BPA, your drinking water is unprotected every time city water pressure drops.
How Much Does Backflow Prevention Cost in Mesquite?
Costs vary by assembly type and installation complexity.
Hose bibb vacuum breaker: $5 to $12 per device. Homeowners can install these without a permit.
Pressure Vacuum Breaker (PVB): $150 to $400 installed, depending on pipe size and accessibility.
Double Check Valve Assembly (DCVA): $250 to $600 installed. Most common for residential irrigation connected to city sewer.
Reduced Pressure Zone (RPZ): $400 to $900 installed. Required when a septic system is present on the property.
Annual testing: $50 to $150 per assembly, paid to the licensed tester. The $25 city inspection fee is additional.
These costs are modest compared to the consequences of a backflow incident. Contaminated drinking water can cause illness, and a backflow event that reaches the municipal supply can result in significant liability for the property owner.
Can a Homeowner Install a Backflow Preventer in Mesquite?
No, not for testable assemblies. The City of Mesquite requires a plumbing permit and a licensed plumber registered with the city to install any backflow prevention assembly with test ports. This includes DCVAs, PVBs, and RPZs.
Homeowners can install hose bibb vacuum breakers on outdoor faucets without a permit. These thread-on devices are available at Home Depot, Lowe’s, and most hardware stores.
For irrigation system BPAs, a licensed irrigator registered with the City of Mesquite may also perform the installation. However, many homeowners prefer having a licensed plumber handle both the BPA installation and the connection to the home’s potable water supply to ensure the entire system is code-compliant.
James Armstrong Plumbing is registered with the City of Mesquite and handles the full process: permit application, assembly selection, installation, coordination with the Public Works Backflow Inspector for testing, and submission of TCEQ Form 20700 documentation. Call 214-918-6109 to schedule an evaluation of your property’s backflow protection needs.
How Do I Find a Licensed Backflow Tester in Mesquite?
The City of Mesquite maintains a list of licensed backflow testers registered to work within city limits. You can request this list by contacting the Public Works Backflow Inspector at 972-216-6947.
The TCEQ also maintains an online licensing database where you can search for licensed Backflow Prevention Assembly Testers (BPATs) in your area.
When hiring a tester, verify the following:
- Active TCEQ backflow tester license
- Current registration with the City of Mesquite
- Calibrated test equipment (gauges must be tested for accuracy annually)
- Willingness to coordinate with the Mesquite Public Works Backflow Inspector, who must be present during testing
Protect Your Family’s Drinking Water
Backflow prevention is not optional in Mesquite. It is a city code requirement enforced by the Public Works Department, backed by TCEQ regulations, and grounded in the basic need to keep your drinking water safe.
If you have an irrigation system, swimming pool, or any connection between your potable water supply and a non-potable source, your property needs a functioning, tested backflow prevention assembly.
James Armstrong Plumbing serves Mesquite and the surrounding DFW cities, including Garland, Rowlett, Balch Springs, and Sunnyvale. Contact us at 214-918-6109 to schedule a backflow prevention evaluation, new installation, or annual testing coordination.
