Who Do You Call to Have a Backflow Test Done on Your Sprinklers?

This one’s a job for certified professionals only

Lawn sprinkler connected to a hose
Photo: olejx / iStock / Getty Images Plus / Getty Images
Lawn sprinkler connected to a hose
Photo: olejx / iStock / Getty Images Plus / Getty Images
Get quotes from up to 3 pros!
Enter a zip below and get matched to top-rated pros near you.
Geo Icon

Irrigation backflow preventers are a critical part of your sprinkler system because they prevent contaminated water from infiltrating clean drinking water sources. If you’re having issues with this sprinkler part, knowing who to call to have a backflow test done on your sprinklers is essential.

Since they perform such an important function, most cities and states require backflow devices to be tested on a regular basis—sometimes as often as once a year—by certified sprinkler repair professionals. Backflow testing can’t be DIYed by people who don’t have the proper certifications and licensure from their state. Let’s review the best type of professional to hire for this lawn irrigation service.

Angi Tip

Backflow testing is not a DIY job. You could face legal consequences if you try to conduct a backflow test on your sprinklers without certification. Call a sprinkler pro to complete this test quickly, safely, and legally.

Kassidy Barber
Content Editor, Angi

Benefits of Hiring a Professional to Do Your Backflow Test

Professional sprinkler back flow test
Photo: BanksPhotos / iStock / Getty Images Plus / Getty Images

Hiring a sprinkler repair professional to perform the testing on your irrigation’s backflow preventers is mandatory. 

In order to certify to the city government that your backflow preventers are in good working order, the professional who performs the test must have special training in backflow assembly testing. In some states, they may also need to be a licensed contractor to get that training in the first place.

Depending on where you live, these backflow tests may be required yearly or every two to three years to keep your drainage system in working order. Check with your local government to learn more about the specific requirements in your area.

Can I DIY a Sprinkler Backflow Test?

Unfortunately, people who are not trained professionals can’t perform their own sprinkler backflow tests. If you happen to be a licensed contractor, you may be able to take the course required to perform a backflow test—but for most homeowners, this is a job that has to be left up to the pros.

Can I Hire a Plumber to Do the Backflow Test?

Some plumbers perform irrigation backflow prevention tests, but it depends on what kind of training and certifications they have. Some companies specialize specifically in backflow prevention testing. Their whole business model simply relies on these tests. But if you have a plumber you know and trust, it could be worth reaching out to see if they can perform your backflow tests for you.

Certain local sprinkler repair companies may also have certified professionals on staff who can perform these tests. 

How Do Professionals Do Sprinkler Backflow Tests?

Sprinkler backflow preventer illustrated

During the backflow test, your water will temporarily be shut off—but don’t worry, the test only takes about 20 or 30 minutes to complete.

Backflow testers use specialized, state-approved tools and gauges to measure your system’s water pressure calibration. (After all, backflow only happens if the pressure of the contaminated water outstrips the pressure of the drinking water source—so measuring pressure is the name of the game.) The backflow testers will open and close the various valves in your plumbing setup to make sure everything is working properly. If it is, they’ll certify your device, report as much to the state, and turn your water back on.

Frequently Asked Questions

Short answer: Yes. If there’s a chance that your irrigation water could backflow into a potable water source, you are very likely legally required to have a backflow preventer on your sprinkler system. Otherwise, you run the risk of contaminating clean, drinkable water with pesticides, fertilizers, pet waste, and more.

When assessing the health of your backflow preventer, there are several signs to be on the lookout for. For instance, if you notice a sudden drop in water pressure, a faulty backflow valve may be the culprit. If the water inside your home has a strange taste, smell, or color, your backflow valve may also be implicated—and you should call a professional to assess both the device and the safety of your drinking water right away.

In most cases, the backflow valve is located near your home, where the irrigation system connects to the water supply. (After all, the whole purpose of this valve is to prevent the irrigation water from back-flowing into the potable water source.) If you’re not sure how to find your sprinkler backflow valve, an irrigation or plumbing professional can likely help you.

If you don’t have a backflow preventer, dirty water from your irrigation system may be able to flow back into your clean, potable water source—leading to contamination and potentially to human illness, too. In addition, in most cities and states, having a backflow preventer is a matter of legality: Along with installing the devices in the first place, you’re also obligated to regularly have them tested.

Need professional help with your project?
Get quotes from top-rated pros.
The homeowners guide to lawn irrigation services
From average costs to expert advice, get all the answers you need to get your job done.
Automatic garden lawn sprinkler
Mar 21, 2025
Mar 21, 2025
Looking to learn how to clean your sprinkler heads for a strong, healthy lawn? Look no further—here are five simple steps to achieve this easy DIY project.
Automatic sprinkler system
Mar 13, 2025
Mar 13, 2025
Putting your sprinkler system to bed for winter will help avoid damage from freezing temperatures. Use this guide to winterize your sprinkler system.
Close-up of a drip irrigation system
Mar 13, 2025
Mar 13, 2025
Learning how to convert your sprinkler to drip irrigation saves you money on water use and reduces weed growth. Follow this guide to learn how to do it.
 luxury  house with lush lawn
Mar 13, 2025
Mar 13, 2025
How long to water your grass depends on the type of grass, the season, where you live, and more. Learn when to stop watering grass with this guide.
Woman and child running through sprinkler in yard.
Mar 24, 2025
Mar 24, 2025
Learn how to adjust Rain Bird sprinkler heads, no matter the type. Fine-tuning your sprinklers ensures optimal water usage and reach.
Multiple stream sprinkler head
Mar 13, 2025
Mar 13, 2025
Looking for pointers on how to design a sprinkler system? Use this guide to navigate the process and create the DIY sprinkler system of your dreams.
Share project details to get started.