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What is a Slab Leak? 7 Signs You Are Dealing With One

April 30, 2025
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A slab leak is a common plumbing concern. Since this type of leak is not visible to the naked eye, it can leave homeowners confused about where the damage is coming from. In this blog, we will discuss what a slab leak is and the signs that indicate you are dealing with one!

What Is a Slab Leak?

A slab leak is a term for a leak that develops in copper water lines running below a home’s concrete foundation. Slab leaks are serious because they can damage the home’s foundation. The water can wash away the soil under the house, causing cracks and shifting underneath. If not fixed, a slab leak can also lead to mold, floor damage, and higher water bills.

What Causes Slab Leaks?

Slab leaks can be caused by various reasons, such as:

  • Corroded or old pipes
  • Soil shifting
  • Improper pipe installation
  • Pipe abrasion
  • Excessive water pressure

How To Tell If You Have a Slab Leak?

If left unnoticed, slab leaks can cause extensive damage to your home. Here are some signs that indicate this plumbing issue:

  1. Increased Water Bills
    If your water bill suddenly goes up but your usage hasn’t changed, it might be due to a hidden leak. Slab leaks waste water under the house, leading to higher bills without you realizing it.
  2. Low Water Pressure
    When water pressure drops throughout your home, it could mean that water is escaping before it reaches your faucets. A leak under the slab can reduce water flow in your pipes.
  3. Damp or Wet Flooring
    Wet spots, dampness, or warm areas on your floor, especially on concrete, can indicate a slab leak. Hot water leaks can make the floor feel warm in certain spots.
  4. Sounds of Running Water
    If you hear water running but all taps and appliances are turned off, it’s a clue that water may leak from somewhere hidden, like under your foundation.
  5. Pooling Water
    Water leaking from a slab can rise to the surface and create puddles or damp areas near your home’s foundation, even if it hasn’t rained.
  6. Mold, Mildew, or Unusual Odors
    A constant leak creates moisture, leading to mold and mildew growth. This often causes a musty smell and can lead to health problems over time.
  7. Cracks in Walls or Flooring
    When water from a slab leak washes away the soil under your house, it can cause the foundation to shift or sink, leading to new cracks in the walls, floors, or foundation.

What To Do Next?

If you suspect these signs, make sure to do the following:

  • Turn off your main water supply to prevent further damage
  • Call professional help for slab leak detection and prompt resolution
  • Discuss repair options with your licensed plumber, depending on the severity and location of the leak

Final Word

A slab leak is a leak in water pipes beneath a concrete foundation slab, causing extensive water damage and other problems. Apart from water damage, major signs that indicate a slab leak are increased water bills, low water pressure, unusual sounds, mold growth, and cracks in walls.

Call plumbers at Alliance Plumbing Services for prompt, reliable, and accurate slab leak detection. Call us for more queries at (281) 547-2518.

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