Answer first
A slab leak is a pressurized line failing under or in the concrete slab. Early signs beat late foundation and mold problems.
01
Definition
What is this?
Slab leaks occur when supply piping under a concrete floor fails. Water follows the path of least resistance — into the slab, soil, or living space.
02
When to use
When does this apply?
Investigate unexplained high usage, warm spots on floors, the sound of running water when fixtures are off, or moisture at baseboards without a visible source.
03
Failure modes
What goes wrong?
Ignoring a rising water bill. Assuming a humidifier or weather caused the wet carpet. Demolishing before leak location.
04
Proof
Why trust this guidance?
Hurst locates and repairs supply failures in Central Kentucky homes — including under-slab paths — with methods matched to the building, not a one-size demolition plan.
05
Action
What should you do next?
If you suspect a slab leak, shut the main if flooding, then call for leak detection before opening floors blindly.
Meter check: note the dial with all fixtures off — movement suggests a leak.
Glossary
Key terms for this guide — full definitions live in the Hurst plumbing & electrical glossary.
Questions homeowners ask
FAQ
Is a warm floor always a slab leak?
Not always — radiant heat and sun exist — but a warm strip with rising usage deserves a check.
Can it wait until next month?
Pressurized leaks get worse. Early detection usually costs less than late structural drying.
Will insurance help?
Policies vary. Document photos and meter readings; we can provide findings for your adjuster.
Author & reviewer
Hurst Electric & Plumbing
Reviewed by Hurst Electric & Plumbing
Company-level review by the licensed Hurst plumbing and electrical team in Danville, KY — a dual-trade shop. Guidance reflects how we diagnose on-site, explain scope in writing, and close out under the Hurst standard. Last updated .