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Leaks | 5 min read

6 Warning Signs of a Slab Leak

Warm floor spots, the sound of running water, a high bill, damp flooring, low pressure and cracks can all signal a slab leak.

By The Plumbing Co Team | Updated November 1, 2026
6 Warning Signs of a Slab Leak
Quick answer: Warm floor spots, the sound of running water, a high bill, damp flooring, low pressure and cracks can all signal a slab leak.

A slab leak is a leak in a pipe under or inside the concrete slab of your home. It can harm floors and soil. Watch for these signs.

1. A warm spot on the floor A hot water line leaking below can warm the floor.

2. The sound of running water You hear water when all taps are off.

3. A high water bill A leak can run all day and night.

4. Damp or buckling floors Wet carpet, warped wood or lifted tile can signal water below.

5. Low water pressure Water escapes before it reaches your taps.

6. Cracks in walls or floors Wet soil under the slab can shift and crack concrete.

What to do - Close the main water valve - Call us for slab leak repair - Do not ignore it, because damage grows

How we repair it We find the spot with listening tools and pressure tests. Then we explain options: spot repair, rerouting the pipe or repiping. Not sure it is a slab leak? Read how to find a hidden leak.

Plumbing Services Related to This Article

Repiping

Old or rusty pipes? New PEX or copper pipes give you clean, steady water.

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  1. Call or Book Online

    Tell us what is wrong. We ask a few quick questions and book a time.

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We protect your floors, explain the work in plain words and tidy up.

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We know how hard water and local soil affect pipes in the Elsinore Valley, so repairs last longer.

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Common Questions: 6 Warning Signs of a Slab Leak

Is a slab leak an emergency?

It is urgent. Shut off the main valve and call us.

Can I fix a slab leak myself?

No. It needs special tools and a licensed plumber.

Can you fix it without breaking the floor?

Sometimes we can reroute the pipe through the walls or attic.

Can a slab leak cause mold?

Yes. Lasting moisture can lead to mold.

What causes slab leaks?

Old pipes, shifting soil, high pressure and hard water wear.

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