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.

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