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
Thank you Legacy Plumbing! A big wet mess began the first week of August. Awful! Two different plumbing companies were contacted and came out to handle the issue(s) for us. We were not pleased with their service and the situation remained, with additional “flooding issues” from a small 1/2 bath. Almost $900 into this ordeal, flooding reoccurring and with only new wall water turn off added, potty pulled and reset crooked and a cleanout on one of the exterior places, not even checking the other 3. Their camera did not show any problem. Thank goodness my annual Best Pick Reports arrived in the mail and I read up on the best of the best plumbing companies. I read all 5 recommendations and selected Legacy Plumbing on gut instinct. There are so many good things to say about Legacy. First, the polite, informed and helpful office staff as well as the experienced, great men they send to the job. My situation was a tough fix. From the beginning I was kept informed of the steps being taken, the time proposed time frame, etc. Each person I dealt with, whether by phone or in person, was polite, professional yet friendly, super knowledgeable, and with excellent people skills and attitudes to match. I would rate Legacy Plumbing 10 Stars, 5 is not high enough! Legacy Plumbing will be my go-to plumbing company forever. Our situation was not a normal one and required extensive repair work. We met different plumbers for the separate “fixes” of this issue. We would like to thank Sean Reecer and “THE specialist”, Wayne. Wayne kept us informed of each step as well as the way to fix the problem once all diagnostic procedures were performed. Both these men had young apprentices watching, helping, learning that worked with them in our home. Our thank you’s also to Gerald, James and Alex. How could all of these be great? Do not know but they were. All so professional with good people skills along with their plumbing knowledge. A big, nasty job repaired by a first-class company that cares about their customers. We are customers for life. THANK YOU all! Legacy Plumbing and Theron, you are the real deal!
Connie W.
Slab Leak
SUPERIOR !!! Thank You, Sam and Alex, for a job Well Done! I chose Legacy Plumbing to repair a pipe leak in the kitchen wall. Wow, Sam's knowledge, precision, and skill in his craft are impressive. And both Sam and Alex demonstrate extraordinary customer service. You two are surely an asset to this company. Glad I joined your gold program Look forward to having you guys come back for bathroom repairs. EXCELLENT COMPANY !!!
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!