Discovering a leaky pipe in your home isn’t great, but it’s better if it’s in a visible spot like under a sink or in the basement with an exposed ceiling. However, leaks in the slab, which is the foundation under your home, are trickier because there are no alarm systems to warn you. Finding these leaks early is crucial as they can lead to serious damage, including issues with the foundation. Since there’s no built-in warning, detecting a slab leak can be challenging, and by the time you notice it, a lot of damage might have already happened. So, it’s important to learn how to detect a water leak under a slab early to prevent significant harm to your home.

What is a Slab Leak?

A slab leak happens when there’s a water leak in the copper pipes under the concrete foundation of your home. If this kind of leak is above ground, like in the wall or ceiling, it’s called a pinhole leak, usually caused by long-term corrosion in copper pipes. Slab leaks can be on the pressure side or drainage side of your foundation. Finding pressure side leaks is easier and can prevent a lot of damage if detected early.

On the drainage side, leaks are harder to notice and can go on for a long time without showing outside signs. Over time, slab leaks can harm hardwood floors, carpets, drywall, and cabinets, potentially leading to mold and fungus issues if not fixed within 24 hours. Regular professional plumbing inspections are essential to catch and repair slab leaks before they cause extensive damage to your home.

Causes a Slab Leak?

Pipes under a concrete slab might start leaking for two main reasons:

  • Pipes made from older materials like cast iron, galvanized steel, or Orangeburg can corrode over time.
  • The ground shifting due to factors like expansive soil, earthquakes, or other disturbances can also lead to leaks.
  • Additionally, tree roots can invade and puncture pipes, emphasizing the importance of considering tree proximity during home construction.
  • Using commercial waste pipe cleaners can damage pipes, underlining the need to hire a certified and experienced plumbing contractor for such tasks.

Signs of a Slab Leak

  • Unexpected increases in your water bill
  • Hearing running water when pipes are not in use
  • Finding moisture or mildew beneath carpets
  • Noticing a moving water meter dial when pipes are idle
  • Seeing standing water around your house’s perimeter
  • Experiencing unusually low water pressure
  • Observing cracks in your baseboard or walls
  • Sensing damp or warm floors
  • Dealing with mold issues or detecting a moldy smell

How to Detect a Slab Water Leak?

How to detect a water leak under a slab foundation? If you notice warm spots or water stains on the floor, it can help you figure out where a slab leak might be. When it’s not easy to find, plumbers can drain the water from the building’s pipes and pump in air to locate leaks. For hot water leaks, plumbers might use thermal imaging to find the exact spot. Special sound equipment can also be used to pinpoint the precise location of a leak. Professional plumbers have different methods to identify and fix slab leaks to ensure they can address the issue accurately.

How to Fix a Slab Leak?

Fixing a leak under a concrete slab is not easy since reaching the pipes is tricky. Often, the concrete foundation needs to be dug up to get to the pipe, or the pipe might be rerouted. Due to the complexity, it’s advisable to have an experienced plumber handle concrete slab leak repairs. Professionals use leak detection tools to find the issue’s source and minimize disruption to your home. In Texas, homeowners’ insurance might cover slab leak repair costs, but it’s wise to confirm with your insurance or a plumber. With early detection and proper maintenance, you might even prevent a slab leak from happening in the first place.

Who Should Repair a Slab Leak?

Always get a professional, like a plumber or contractor, to fix slab leaks. It’s not safe to try it yourself, and you could make things worse. Professionals have the right tools and know-how to diagnose and repair the issue correctly to prevent future problems. When you call a pro, they will inspect the area and use special tools to find the leak.

Once they identify it, they will decide what repairs are needed, which can range from patching the pipe to replacing parts. In some cases, they might have to dig up part of your foundation. Regular maintenance and hiring a certified plumber can help keep your home safe from slab leaks. With these precautions, you can have peace of mind that your home is free from leaks.

Slab Leak Repair in Texas

If you observe any of the warning signs mentioned earlier, don’t hesitate to contact SS Water Restoration immediately in Frisco. Slab leaks have a certainty – they worsen when ignored. Trust our experienced team to handle the repair correctly and swiftly. Scheduling an appointment with us today ensures that we address the issue promptly to prevent further damage to your home. Don’t delay; let us take care of the problem for you.

FAQs About Slab Leak Repair

How do I know if my pipe bursts under my slab?

If you suspect a burst pipe under your slab, watch for signs such as a sudden decrease in water pressure, unexplained water pooling around your home’s perimeter, or noticeable cracks in your walls or baseboards. You may also hear the sound of running water when no faucets are in use. If you notice any of these signs, it’s essential to seek professional assistance promptly to assess and address the situation, as burst pipes can lead to significant damage if left unattended.

How do I find an underfloor leak?

To find an underfloor leak, pay attention to signs like unexplained increases in your water bill, the sound of running water when pipes aren’t in use, or damp spots on the floor. You can also check for warm spots, mildew, or cracks in your walls. If you suspect a leak, a professional plumber can use specialized equipment, including leak detection tools, to pinpoint the exact location of the underfloor leak and recommend appropriate repairs.

What is the best method to locate a water leak beneath a concrete slab?

The best method to locate a water leak beneath a concrete slab is to hire a professional plumber like SS Water Restoration, who uses specialized tools such as electronic leak detectors, thermal imaging, and sound equipment. These tools help pinpoint the precise location of the leak without causing extensive damage to the concrete foundation. Professional plumbers have the expertise to assess the situation accurately and recommend the most effective and least invasive repair solutions.

What is the best way to find a slab leak?

The best way to find a slab leak is to hire a professional plumber experienced in leak detection. They use specialized tools like electronic leak detectors to pinpoint the exact location of the leak under the concrete foundation. These methods are efficient and minimize damage to your home.


Spotting slab leaks early is crucial for preventing serious damage to your home. Look out for signs like unexpected spikes in water bills, running water sounds when pipes aren’t in use, or damp spots on the floor. If you notice any of these signs, it’s important to call a professional plumber to inspect and locate the leak. Professional plumbers use specialized tools, such as thermal imaging and sound equipment, to identify the source accurately. Trying to fix a slab leak yourself can be risky, so it’s best to rely on experienced professionals who can diagnose the issue, make necessary repairs, and ensure your home stays leak-free. Regular inspections and proactive measures contribute to maintaining a safe and sound home.