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Slab leaks
Slab Leak Water Damage in Mesquite, TX
Warm spot on the floor, a water bill that jumped, a musty smell with no spill to blame. Any of them can mean a leak under the slab. A plumber has to find and fix the line. We deal with the water it left behind.
Short answer
A slab leak is a leak in a water or drain line that runs in or under your concrete foundation. In Mesquite houses it usually shows up as a warm spot on the floor, a sudden jump in the water bill, running-water sounds when everything’s off, or flooring that cups. A licensed plumber has to find and repair the line. Then we extract the water and dry the structure to the dry standard.
Weeks
How long a slab leak can run unseen in clay soil
Category 3
Water from a broken drain line, even if it looks clear
3 to 5+ days
Typical drying, longer for slabs
Often covered
The water damage, but usually not the pipe repair
How do I know if I have a slab leak?
Most people notice one of these first:
- A warm or hot spot on tile, laminate or vinyl plank, often from a hot water line
- A water bill that jumped when nothing changed in how you use water
- The sound of running water when every fixture is off
- Flooring that cups, lifts, buckles or feels soft underfoot
- A musty smell near baseboards with no spill to explain it
- Damp carpet along a wall, or baseboards that swell
- A wet strip along the foundation edge or in the yard
Can I check with my water meter?
Yes, and it takes two minutes. Shut off every faucet and every appliance that uses water, inside and out. Then look at your meter. Most have a small flow indicator, a dial or a triangle, that moves whenever water passes through. If it’s moving with everything off, water is going somewhere. A running toilet is a common false alarm, so check those first. If the indicator keeps moving, call a plumber.
Why do slabs leak so much in Mesquite?
Two reasons: the dirt and the age of the houses.
Mesquite sits on Blackland Prairie clay. It swells when it’s wet and shrinks hard through a dry Texas summer, and the slab rides along with it. Every swell-and-shrink cycle flexes the water and drain lines running through and under the floor.
Then there’s age. In the older neighborhoods, the drain lines under the slab are often cast iron, which was the standard through the 1970s and into the early ’80s. Cast iron rusts from the inside out, so a line can look fine and still be paper-thin. Copper supply lines wear thin over decades and can pinhole.
Most Mesquite houses are slab-on-grade and basements are rare, so nothing catches the water. It goes into the soil under the slab, and the clay soaks it up. That’s how a slab leak runs for weeks without leaving a puddle.
Is it a supply line or a drain line? It changes everything.
| Supply line leak | Drain line leak | |
|---|---|---|
| What leaks | Clean, pressurized water | Wastewater from sinks, tubs and toilets |
| Common clues | Warm spot, jump in the water bill, running-water sound | Sewage smell, gurgling or slow drains, damp areas along the drain path |
| Water category | Category 1 at first, and it can worsen with time | Category 3, even when it looks clear |
| What it means for cleanup | Often dried in place when caught early | Contaminated materials removed, area disinfected, then dried |
That category call decides what we can dry in place and what has to come out, which is why we ask about smells and slow drains when you call.
What does the water do once it’s under there?
It travels. Water that gets out under a slab follows pipe trenches and low spots, comes up at cracks, joints and the slab edge, and then wicks into whatever it touches.
- Flooring: runs under tile, laminate and vinyl plank long before it shows, then cups or lifts the planks.
- Walls: drywall wicks water up from the bottom, and baseboards swell.
- Cabinets: the particleboard in toe kicks and bases soaks it up and swells.
- Mold: wet drywall, carpet pad and wood can start growing mold within 24 to 48 hours if they aren’t dried.
- Soil: a long-running leak can soften the dirt under the slab. If you see new cracks or doors that stick, ask your plumber whether a structural evaluation is worth getting.
Who fixes what after a slab leak?
| Who | What they do |
|---|---|
| Licensed plumber | Finds the leak and repairs or reroutes the line. Get your options in writing, with prices. |
| LeakRush | Extracts the water, maps moisture, removes materials that can’t be saved and dries the structure. |
| Your insurance company | Decides coverage under your policy. Report promptly and ask your agent what it says about slab leaks. |
| Foundation or structural specialist | Only if there are signs of movement, like new cracks or doors that stick. Your plumber can tell you whether it’s worth asking. |
We don’t find or repair leaks, and we won’t pretend to. Our emergency water extraction in Mesquite work starts once the line is stopped: measure it, pull it out, dry it, so it doesn’t turn into mold, swollen cabinets or flooring that fails a month later.
How do you dry a house after a slab leak?
- Wait for the line to be stopped. Nothing dries while water’s still coming in.
- Map the moisture. Pin and pinless meters and a thermal camera show how far the water traveled, including under tile and plank.
- Extract and remove. Standing water and water in carpet and pad come out. Anything that can’t be saved comes out with a photo and a reason. With a drain-line leak, carpet and pad always go.
- Dry the slab and the structure. LGR dehumidifiers and air movers run with the house closed up and the AC on. Concrete gives water back slowly, so slabs usually take longer than walls.
- Verify before anything goes back. Nobody should lay new flooring over a slab that still reads wet. You get the readings and drying logs.
Do I have to move out? Not for a clean supply-line leak, usually. Expect steady fan noise and a warm house. If it was a drain line, stay out of the affected rooms until they’re cleaned.
Is a slab leak covered by insurance?
Often the water damage is covered but the pipe repair isn’t, and some policies limit coverage for breaking through the slab to reach the leak. A leak that ran for weeks can be treated as continuous, which most policies exclude. Wording varies a lot, so read the water damage and plumbing sections of your policy.
Should I call my insurer before the plumber starts cutting? If you can, yes. Photograph the area, ask the plumber for written findings, and ask your agent what the policy says about access costs before the work starts. The Texas water damage insurance guide walks through the full claim.
Slab leak questions, answered
Can a slab leak be fixed without breaking the concrete?
That’s the plumber’s call. Options can include breaking through the slab to reach the line, or rerouting the line through the walls or attic. Ask for each option in writing, with a price.
How long can a slab leak run before I see damage?
Weeks or longer. Clay soil soaks up leaking water, so there may be no puddle at all. A jump in the water bill is often the first sign.
Why is one spot on my floor warm?
A warm spot is often a hot water line leaking under the slab and heating the concrete above it. A plumber can confirm it, and it’s a good reason to call one the same day.
Does a slab leak mean my foundation is failing?
Not necessarily. Foundation movement can break pipes, and a leak can soften soil, so the two are sometimes connected in either direction. A structural engineer can answer it for your house.
Is water from a slab leak dangerous?
Water from a supply line starts out clean, but clean water can become contaminated over time. Water from a broken drain line is Category 3 and should be treated as contaminated even if it looks clear.
How do I know the floor is actually dry?
By measuring it. We compare moisture readings in the affected material with readings in the same material elsewhere in your house, and we keep the equipment running until they match.
How much does slab leak water cleanup cost?
It depends on the water category and how much got wet. Published Dallas ranges are about $3.50 to $4.50 per square foot for clean water and $7.00 to $7.50 for a Category 3 drain-line leak, plus drying equipment when it’s billed separately. The cost guide has the details.
What should I tell my plumber about the water damage?
Tell them where the floor is wet or warm, when you first noticed it, and what your meter test showed. Ask for written findings and photos of the leak, and share them with us and your insurance agent. Our first 15 minutes guide lists what to photograph before anything is moved.
Keep reading
Water coming up through the floor? Call now.
Shut off the main, take a few photos and call. We will tell you what we think is going on and what happens next.
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