Slab Leak Detection & Repair

For the very best in slab leak detection, location, and repair, North Texas homeowners know that no one is more capable than Legacy Plumbing. With an all-star team of experienced plumbers, you can be sure we will be able to quickly and efficiently locate and repair any slab leak regardless of size or difficulty.

We only hire the most knowledgeable, skilled technicians. We will arrive on time. You will always know the price before any work begins and we will leave the area of repair cleaner than we found it.

Call us now for more information and to get on the schedule, or keep reading to learn more about how we approach both sewer slab leaks and water line slab leaks.

Water Slab Leak

The vast majority of homes north of DFW that were built between the 1960s and 2010s have copper water lines under the slab foundations. Copper makes an excellent water line, but over time pin-hole leaks have the tendency to develop. This can be caused by improper installation, the water line touching concrete or a piece of ferrous metal, or turbulence in the water line.

1. Symptoms

Signs of a water line slab leak may include:

  • A hot or warm spot on the floor
  • Wet spots on the floor 
  • Cracks in the flooring
  • Sounds of running water 
  • Abnormally low water pressure
  • A sudden increase in your water bill
3. Locating

In order for the test to be successfully performed, there must not be any leaky faucets or toilets and the house line must be successfully isolated from the yard line. After a leak has been confirmed, Legacy Plumbing uses top-of-the-line water leak detection equipment, such as acoustic listening devices and electronic line locators to locate the leak and determine the severity of any damage.

2. Testing

For water leaks, Legacy Plumbing typically starts by confirming a leak by pressure testing the lines. A pressure gauge is typically connected to a faucet and the water is turned off at the meter or at the shut off valve in the yard. The pressure on the gauge is monitored to determine if there is a loss of pressure.

4. Repair

Water Leak Repairs can be made through small slab penetrations or by tunneling under the perimeter. In some cases, re-routing waterlines is a more economical solution, especially when the overall pipe system is corroded. When applicable, re-routing waterlines can also be used to prevent damage to expensive flooring. Read our blog article on the Four Ways to Fix a Slab Leak for more information.

Sewer Slab Leak

Unfortunately, the Dallas area’s soil is notorious for causing slab foundations to shift over time. This ends up causing many of the sewer slab leaks in our area. Other causes can be corrosion of the pipes or inferior workmanship when the plumbing was initially installed. Once you are aware of a potential leak, the first step is to track it down.


For sewer and drain leaks, Legacy Plumbing uses isolation test balloons and in-line camera equipment to locate the area(s) of the leak. A test ball is placed in the main sewer line at an exterior cleanout. The lines are then filled with water and monitored at the floor level to determine if the water drops. If the water does drop, a leak is confirmed. Isolation testing and running a camera in the line are the next steps to determine the exact location of the leak(s). Learn more about this on our Sewer Camera Inspection service page.


After our findings, we will consult with you to plan the best course of action in order to get the leak repaired. There are many factors to evaluate to determine the best way to repair or replace a water or sewer line, including overall plumbing layout, house layout, slope, length, and depth of the lines. Legacy Plumbing has extensive experience in both water line slab leaks and sewer slab leaks and will walk you through the best solution to repair your slab leak.

If you suspect you have a slab leak, you can trust Legacy Plumbing to get it resolved accurately, thoroughly, and efficiently.

Our Work is Our Word.

Slab Leak
Enoch just serviced our home. He could not be any better if he tried. He even stopped by one night on his way home just to see if everything was alright. When he was here, he discovered we had a leak in our main feed line to our home while he was fixing something else. Highly efficient, friendly, and knowledgeable. Very satisfied with the service.
Slab Leak
Yesterday we heard an unusual sound in the wall that sounded like water running, so we feared there was a slab leak. We contacted Legacy Plumbing when our son and daughter-in-law referred us to Legacy Plumbing, the company that installed a new water heater for them in the summer of this year, 2019. They had great service then, so we checked Legacy's website and read customer reviews. That sealed it for us, and the owner, Theron Young, got on the phone to speak to me and explained the possible issue we might be having. He explained fully the job estimates and came across as very professional. His taking the time to explain things helped very much. So the appointment was made for the following day, and we were extremely pleased with Matthew and his apprentice Steven who were real professionals. The company has obviously taught its employees to be courteous, helpful, on-time, and well-trained to answer any questions we had. We trusted these men immediately and were greatly relieved when they quickly discovered that we merely had a leak in an outdoor faucet. Matthew then gave us a definite estimate of the job he and Steven had to accomplish to repair the leak by replacing the part of the faucet exposed to the outdoor. He had to cut through mortar and possibly remove a stone in the wainscotting but did a super job of repairing the hole so neatly. Very impressed! These gentlemen were so pleasant and communicated very effectively. We highly recommend this company and will not hesitate to request the team of Matthew and Steven in the future. They should have bright futures with Legacy Plumbing! Thank you, guys, for a job well done! We should be able to give you both and your company more than 5 stars!
Jack & Sharon S.
Slab Leak
Our experience with these guys was very positive! We had a hot water leak under our home's slab, which was rather stressful. Wayne took the time to explain everything in-depth, discussed all the options and the pricing. He was extremely knowledgeable, professional, informative, and honest. We were very happy with the pricing, and the amount of time it took to complete the project successfully. The apprentice, Schuyler, was also very professional and helpful! I would definitely go to these guys for any future repairs, and would highly recommend them to all my friends and family! It's great to have found such honest, hardworking, and knowledgeable folks that can be relied on for home repairs. Thank you, guys!
Slab Leak
You were the third company I called. I was told I had a major issue with my home plumbing under my slab. Wayne Pierce and James came out and diagnosed very quickly that was not the case. The completed their job quickly and were very thorough. They saved me a ton on my money. I am very grateful. So glad I called. This will be my first call next time. No offense, I hope there is not a-next time! Thank you!
Kenneth Harrell
Slab Leak
We discovered on Sunday (labor day weekend) we suddenly had heated floors in in the laundry room - nice. Also the cold water faucets in the kitchen and laundry room provided warm water. Yes, a water-leak in the slab. Called Legacy plumbing and got a call back very quickly that went through the options for the reasons and the pricing for the possible scenarios. Kelly McGinn and his colleague(sorry, not good with names) came on Tuesday morning after labor day and diagnosed the problem and fixed the leak. A 1/8" hole in one of the hot water pipe, in the slab. A few hours later it was all fixed and at a fair price - Not the first time over the years that Legacy Plumbing, Kyle and team help us with plumbing issues. All the dry wall, wood etc was put back in place and it was cleaner than before. Thanks - keep up the great work. Sten and Nancy Andersson
Sten and Nancy Andersson