Common signs of a slab leak are a warm spot on the floor, the sound of running water when nothing is on, a water bill that jumps for no reason, and flooring that's damp, cupped or musty with no visible source. A plumber confirms the leak, and moisture readings show how far the water has spread into the floor and walls.
A slab leak is a leak in a water line that runs under or through a concrete floor. Because the pipe is out of sight, the damage usually shows up somewhere else first.
What Signs Should I Look For?
A warm or hot spot on the floor. A leak in a hot water line can warm the concrete above it. You may notice it barefoot, or a pet may favor one spot.
Running water you can't find. A hiss or trickle with every faucet and appliance off.
A higher water bill. Usage climbs without a change in habits.
Damp or damaged flooring. Carpet that's wet with no spill, hardwood that cups, or laminate that swells.
A musty smell in one area of a lower level.
Lower water pressure or a water heater that seems to run constantly.
Any one of these can have another cause. Two or three together are worth a call to a plumber.
How Can I Check for a Leak Myself?
Turn off every faucet, the ice maker and any appliance that uses water. Then check your water meter, or the leak indicator on it, if you can get to it safely. If it keeps moving with everything off, water is going somewhere. Your water utility can tell you where your meter is and how to read it.
That test tells you there's a leak, not where it is. Plumbers locate slab leaks with tools like pressure tests and listening equipment, then decide whether to repair the line in place or reroute it.
Can a Home With a Basement Have a Slab Leak?
Yes. Many homes have basements, but slab leaks still happen. We dry floors and walls after slab leaks in Lee's Summit, Olathe, Overland Park and nearby cities once a plumber has found the leak. Water lines can run under a basement or lower-level floor, under a ranch home or addition built on a slab, or through a garage floor. On a finished lower level, the first sign is often wet carpet or a baseboard that's darker than it should be.
Floor damp and you can't find the source? Call Blue Valley at (913) 395-8488. Open 7 AM–9 PM, every day.
What Happens to the Floor and Walls?
Water from a slab leak moves up and out. It wets the concrete, then the carpet pad, hardwood or laminate on top, and it can wick into the bottom of nearby drywall. Concrete holds a lot of water and gives it up slowly, so the floor can stay wet well after the pipe is fixed.
A moisture reading tells the real answer about how far it went. We map the wet area across the floor and up the walls, pull up only what can't be dried, and set dehumidifiers and air movers to dry the slab and the materials on top. We keep taking readings until everything is back to normal. Our structural drying page explains how we decide when it's dry, and if hardwood is involved, see can wet hardwood floors be saved.
Does Homeowners Insurance Cover a Slab Leak?
It depends on your policy and the cause. Some policies treat the cost of reaching the pipe, the pipe repair itself and the resulting water damage as separate items, and a leak that went on for a long time may be treated differently from a sudden one. Ask your agent how your policy handles each part. We document the damage and the drying with photos and moisture readings to help with the claim. For more, see does homeowners insurance cover water damage.
Frequently Asked Questions
Should I call a plumber or a restoration company first?
Call a plumber to find and fix the leak. If flooring or walls are already wet, call us too, so drying can start once the line is repaired.
Can wet carpet over a slab be saved?
Often, if the water is clean and drying starts quickly. The pad usually holds the most water and is commonly replaced. Readings help decide.
How long does a concrete slab take to dry?
Concrete dries slowly, and the time depends on how long it was wet and what's on top of it. We track readings until it's back to normal rather than guessing at a number of days.
Will the floor have to be broken up?
That's the plumber's call, based on where the leak is and whether rerouting the line makes more sense.
Call our restoration team
If a slab leak soaked your flooring, call Blue Valley at (913) 395-8488. Open 7 AM–9 PM, every day. We're IICRC Certified & Fully Insured. We'll map the moisture and give you a free evaluation. See our water damage restoration in Lee's Summit page for more.