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Plumbing guide

Signs You May Have a Slab Leak

Most homes in the valley sit on concrete slabs with water lines running underneath. Here's how to spot a slab leak early.

Common signs

  • A warm or hot spot on the floor (a hot water line leak)
  • A water bill that jumps with no change in your habits
  • The sound of running water when everything is off
  • Damp carpet, cracked tile or a musty smell near the floor
  • Low water pressure throughout the house

Check your water meter

Turn off every faucet, appliance and the irrigation system. Then look at your water meter: most have a small leak indicator (a triangle or dial). If it's moving with everything off, water is going somewhere, and a slab leak is one possibility.

Repair options

A slab leak doesn't always mean breaking up your floor. Depending on where the leak is, the fix may be a spot repair through the slab, or rerouting the line above the slab through the walls or attic. Rerouting is often less disruptive and avoids future leaks on the old line. We'll explain the options and give you a free estimate.

What to do now

If you see water or suspect a leak, shut off the main water valve and call us. Our phones are answered 24/7.

Need help now? See our leak detection & repair service, or call 951-696-7100. Free estimates, phones answered 24/7.

By Murrieta Valley Plumbing ยท Updated November 8, 2026

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