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Plumbing Tips

How to Tell If You Have a Slab Leak

By Mike Holt, NJ Master Plumber · June 11, 2024 · 2 min read · Updated June 12, 2024

4.9 from 174 Google reviews · NJ Master Plumber Lic. #36BI01345600

Water pouring from a broken pipe onto pavement

Slab leaks, which occur in the water pipes hidden beneath your concrete foundation, can be a real headache. However, many homeowners have no idea when one is present because they often do not know the signs. Here are some signs to watch out for that indicate a slab leak.

Listen for the Sounds of a Leak

One of the first clues to a slab leak might be the sound of running water when no taps or appliances are in operation. This sound can be faint at first, but it might become more noticeable over time. Pay attention, especially at night when things are quieter.

The Floor Is Hot

Slab leaks often occur in hot water lines, and that heat can transfer to the floor above where the problem is occurring. So, if you notice a specific area of your floor feels warm to the touch, especially compared to other areas, it could be a sign that a leak is beneath it. This is more likely on tile or hardwood floors because carpet can insulate the heat a bit more.

Water Woes: Big and Small

A slab leak can cause a variety of water issues for you. You might see unexplained puddles of water around your foundation inside and outside of your home. This is a red flag, especially if you do not have any recent plumbing problems or a leaky appliance. Another sign to look for is cracked walls or floors near the suspected leak site. As the water leaks, it can cause the ground to shift, and this will most definitely lead to cracks.

The Bill Is in… and It Is High!

One of the most common signs of a slab leak is a sudden and significant increase in your water bill. This happens because the leaking water is going to waste, and it will be reflected in your bill. If you have not changed your water usage habits but see a spike, it is a good idea to investigate further.

Calling in the Professionals

If you suspect a slab leak, it is important to call a professional plumber right away. Slab leaks can cause severe damage to your foundation and other parts of your home, so it is best to address them as soon as possible. A plumber can use specialized tools to locate the leak and determine the best course of action for repair.

If you suspect that you have a slab leak, hurry up and call Plumbing Doctor, LLC. We will come to perform an inspection and solve the problem before it becomes a severe disaster. Our aim is to ensure our clients in Somerset, NJ and the surrounding areas feel comfortable and safe in their homes and that their plumbing performs optimally. Let us do the heavy lifting and handle your stress.

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Mike Holt
About the author

Michael Holt

Owner and operator of Plumbing Doctor, NJ Master Plumber (Lic. #36BI01345600) and U.S. military veteran.

More about Mike

Water on the floor right now?

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Do this now

  1. Shut the main valve. Usually where the water line enters, near the meter.
  2. Kill power to anything wet, from the breaker panel, if you can reach it dry.
  3. Open a low faucet to drain the pipes and take pressure off the leak.
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