Backflow Testing in Northeast Texas

Irrigation, fire lines, and some commercial services need a backflow test on a schedule. Underwood tests and repairs backflow preventers across Collin, Grayson, Fannin, Hunt, and Lamar counties.

Test Due, or the Device Failed? Call and We'll Schedule It.

If the city or the water district sent a notice, don’t let it lapse. Call (903) 449-1677 and we’ll put the test on the schedule.

Our Backflow Testing Process

Call or request a quote: The notice, the address, and whether this is a test or a device that already failed.

Test the device: We test it the way the report requires, not a glance at the handles.

Explain a failure: If it fails, you hear which check failed and what the repair is before we replace parts.

Repair or replace: Rebuild kits for the devices we see most are on the van when we can carry them.

Retest: A repair isn’t done until the device passes and the report is filled out.

Leave the enclosure shut: The box gets closed and the area around it left as we found it.

The Underwood Plumbing Standard

Do you test irrigation backflow and commercial devices?

Yes. Lawn irrigation and the commercial devices we’re equipped to test. Tell us the type on the notice when you call so we bring the right kit.

What if it fails?

We repair or replace the failed part and retest. You get the result, not a fail notice and a second company.

Where do you test?

Collin, Grayson, Fannin, Hunt, and Lamar counties, from offices in McKinney, Bonham, and Sherman. City deadlines don’t move, so call when the notice arrives.

How often is a test required?

Most cities and water districts want it yearly. Follow the date on your notice. We don’t set the city’s calendar.

Can a failed device be financed if it has to be replaced?

A full replacement on a larger service can be financed, subject to credit approval. A rebuild is usually a regular service call.

Why Underwood

Why Northeast Texas Calls Underwood for Backflow Testing.

We Communicate.

We schedule the test before the city’s date, and we call you back with the result.

Stocked Trucks, One Trip.

Rebuild parts for the common devices go out on the test, so a failure doesn’t automatically mean a second trip.

Plumbing and Septic, One Call.

If the real problem is the supply line or the irrigation valve past the device, we can fix that too.

Seasoned Service Professionals

Licensed plumbers, TCEQ registered, doing the paperwork the water district actually accepts.

What We Fix

Backflow Tests and Repairs, Start to Finish

Annual tests: run, recorded, and reported for the device on the notice.
Failed checks: rebuilt or replaced, then retested the same visit when the kit is on the van.
Leaking devices: the relief valve and the checks inspected, not just the test cocks opened.
Irrigation preventers: the box opened, tested, and closed so the lid sits flush.
Commercial devices: tested on the schedule the notice names.
Replacements: a new device set when a rebuild won't hold, with the report to match.

Financing Available

We offer flexible payment options for our services.

Signs It's Time to Call for Backflow Testing

A notice from the city or the water district is on the counter.
The relief valve on the device is dripping.
The irrigation won't hold pressure after the preventer.
Last year's test is the one still in the drawer.
The lid of the box is buried or broken.
A remodel added a new connection to the potable line.

Backflow testing for homes and businesses in McKinney, Allen, Prosper, Sherman, Denison, and Bonham.

Reviews

Don’t Take Our Word for It. What Our Customers Say.

Reviews

4.9

(1521 Reviews)

    
 
 
         
   Michael Jeter 
 
 
 
 Trustindex verifies that the original source of the review is Google. Plumber knew his job and how to fix the problem fast.
  
 
        
   Sheldon Nicolle 
 
 
 
 Trustindex verifies that the original source of the review is Google. Chad came by and did an amazing job. Peace of mind is a valuable thing. Thanks Underwood!!
  
 
        
   Saphir Butter 
 
 
 
 Trustindex verifies that the original source of the review is Google. I needed a sewer tank cover replaced due to it being hit by the lawnmower. These guy fixed it in less than 30 minutes.
Chad also suggested putting landscaping stuff around the 4 tanks to prevent this happening again. Totally happy with their service.
  
 
        
   Sally May 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great

More Services

We Solve Every Plumbing and Septic Problem.

Plumbing

Repairs, repipes, and installs for every fixture and line in the house.

Septic Service

Inspections, repairs, and installs for tanks and drain fields.

Septic Pumping

Scheduled and emergency pump outs, with a digital report after each visit.

Emergency Plumbing

Burst pipes and backups. We pick up nights, evenings, and holidays.

Sewer

Camera inspection, spot repair, and full sewer line replacement.

Drain

Clogs cleared and hydro jetting that keeps them from coming back.

Water Heater

Tank and tankless repair and replacement.

Water Quality

Filtration, softening, and testing for clean water at every tap.

Commercial Plumbing

Restaurants, shops, and offices kept running with minimal downtime.

Water Line Repair

Leak location, spot repair, and full water line replacement.

Protect Your Home

Generous Membership Plans.

At Underwood, we offer tailored solutions to keep your home and its systems running smoothly. Whether you need memberships to be county compliant or simply maintain your systems for the long haul, we have a plan to fit your needs.

Get in Touch

Ready to Get the Backflow Tested?

Tell us what’s going on and where and we’ll get a licensed tech out to you ASAP.

Or Skip the Form

(903) 449-1677

Name

Phone

Address

Service

Message

I agree to receive non-marketing SMS messages (appointment reminders, service updates) from Underwood Plumbing and Septic.

I agree to receive marketing SMS messages (promotions, seasonal offers) from Underwood Plumbing and Septic.

Service Areas

Backflow Testing Across Northeast Texas and DFW.

We run out of four offices in McKinney, Bonham, and Sherman.

Counties We Cover

Tests scheduled across Collin, Hunt, Grayson, Fannin, Lamar, and Cooke counties from McKinney, Bonham, and Sherman. Bryan County, Oklahoma is septic maintenance only. We are not licensed to plumb there.

Not sure whether you’re in range? Call (903) 449-1677. Related work: Repiping and Sump Pumps.