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Seven signs of a slab leak

Most Chandler homes are built on a concrete slab, with water lines running underneath. When one of those lines leaks, the signs can be easy to miss.

By the Chandler Home Plumbing & Repair team. Updated November 2026.

Under-slab drain repair
Leak repair through a small wall opening

The seven signs

  • A water bill that keeps climbing
  • A warm spot on tile or carpet, often near the kitchen or a bathroom
  • The sound of water running with every fixture off
  • Damp carpet, swollen baseboards or loose tile
  • A musty smell with no clear source
  • Low water pressure
  • A water heater that runs more than it used to

Check your meter

Turn off every faucet and appliance that uses water, including the irrigation. Find the meter box near the street and lift the lid. If the small leak indicator is turning, water is leaving the pipes somewhere.

What to do next

Call a plumber who does leak detection. The leak should be pinpointed before anything is opened. Once it is found, the fix can be a spot repair, a reroute through the attic, or a repipe if the lines have leaked before.

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