Do I Have a Slab Leak?

A slab leak is a pipe leak under the concrete foundation of your home. Signs include unexpected wet or warm flooring, an unexplained increase in your water bill, the sound of running water when nothing is on, or reduced water pressure. Professional leak detection is needed to confirm and locate it.

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What to Do Right Now

Wet or warm spots on flooring, unexplained water usage or a higher water bill, the sound of running water when no fixtures are in use, or reduced water pressure.

Turn off all faucets, appliances, and fixtures in the home and check your water meter — if the meter is still moving, you may have a leak
Note any areas of flooring that feel unusually warm (can indicate a hot water line leak under the slab)
Check for cracks in walls or flooring — slab leaks can cause foundation movement over time
Take photos of any visible water damage for insurance documentation

What Not to Do

✗Do not assume one symptom alone proves a slab leak — wet flooring can also come from appliance leaks, AC condensation, or surface water
✗Do not start breaking into walls or floors yourself — a professional leak detection service uses acoustic and thermal equipment to pinpoint the source first
✗Do not ignore an unexplained increase in your water bill — it often indicates a hidden leak

When to Call a Professional

Call a plumber if your water meter moves when nothing is running, if you have persistent warm or wet flooring, or if your water bill has increased without explanation. A plumber with leak detection equipment can confirm whether the leak is under the slab and locate it before any concrete is opened.

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FAQ

Do I Have a Slab Leak? — Questions

A plumber uses electronic leak detection equipment — acoustic listening devices, thermal imaging cameras, and pressure testing — to locate the leak under the slab without guessing. This avoids unnecessary demolition and identifies the exact spot to access the pipe.