Slab Leaks in Georgia Homes: The Warning Signs You Can't Ignore

A slab leak is a pressurized water line that has failed underneath your concrete foundation. Not a drain. A supply line — meaning water is being pushed out of it, around the clock, whether anyone is home or not.

It doesn't announce itself. It seeps into the fill dirt under your slab, and by the time you can see it, it's been running for weeks. The good news is that it leaves fingerprints, and if you know what they look like you can catch it early.

Why this is a Coweta County problem specifically

Drive through the subdivisions that went up around Newnan, Sharpsburg, and Tyrone through the 90s and 2000s and you're looking at slab-on-grade construction almost everywhere. No crawlspace, no basement — the house sits on a poured concrete pad, and the water lines run through or under it.

That construction is fine. It's fast, it's stable, and it's everywhere in the metro Atlanta south side. But it means the plumbing you can't see is the plumbing you can't get to. Add Georgia's red clay — which swells when it's wet and shrinks hard in a dry summer — and you get decades of subtle movement working against copper and against any joint under that pad. Combine movement with an abrasive point where a line rubs concrete, or with water chemistry that pinholes copper over time, and a line eventually gives.

The warning signs, in the order people usually notice them

• A water bill that jumped for no reason. Nothing changed. No visitors, no new irrigation, no filled pool. The bill went up anyway. That is water leaving your system somewhere.
• A warm spot on the floor. If the failed line is on the hot side, you'll feel it through tile or laminate — a patch that's noticeably warmer than the floor around it. This one is close to a smoking gun.
• The sound of running water with everything off. Stand in a quiet house at night. Everything closed, ice maker off, nobody flushing. If you hear a faint hiss or a trickle in the floor or the wall, listen harder.
• Hairline cracks in the slab, tile, or drywall that weren't there last year, or a door that suddenly won't latch. Water under a slab moves soil, and moving soil moves the house.
• A musty or mildew smell, especially in one room or under carpet, with no visible source.
• Your water heater running constantly or a hot side that never quite keeps up — because it's heating water that's going into the dirt.
• Damp carpet, cupping hardwood, or a spot on the floor that stays dark. By this point, you have a repair and a restoration.

Run the meter test yourself — it takes 20 minutes

This is the single most useful thing a homeowner can do before calling anybody, and it costs nothing.

1. 1Turn off every water-using thing in the house. Faucets, ice maker, humidifier, irrigation timer, washing machine, dishwasher. Tell everyone in the house not to touch anything.
2. 2Go out to your water meter at the street. Lift the lid. Most meters have a small triangle, star, or dial called the low-flow indicator — it spins on even tiny amounts of flow.
3. 3Watch it. If it's turning at all with the house dead quiet, water is moving through your meter. You have a leak somewhere on your side.
4. 4Now isolate. Shut off the main valve to the house (usually where the line enters, or at the meter). Watch the indicator again.
5. 5Still spinning with the house valve shut? The leak is between the meter and that valve — the service line in your yard. Stopped when you shut the house off? The leak is inside the house envelope — and if you have no crawlspace, that's a strong candidate for a slab leak.

Write down what you saw. That result tells a technician more in one sentence than an hour of poking around would.

How a leak actually gets located

Nobody with any sense starts breaking concrete to go looking. Locating comes first, and it's a process of narrowing:

• Pressure isolation. Shut off the water heater's supply and isolate the hot side from the cold. If pressure holds on one side and bleeds off on the other, you've cut the search area in half before touching a tool.
• Acoustic detection. Pressurized water escaping a pipe makes a specific noise. Ground microphones and amplifiers pick that up through concrete and let a tech walk the sound down to a small area.
• Thermal imaging. On a hot-side leak, an infrared camera reads the heat plume through the floor. Fast, non-destructive, and very good at confirming what the acoustics suggested.
• Tracer gas in stubborn cases — an inert gas pushed through the drained line, which finds its way up through the slab where the breach is.

Good locating is what keeps the repair small. Bad locating is how one leak turns into three holes in your kitchen floor.

The three ways it gets fixed

Once the leak is found, you generally have three paths, and the right one depends on the age of the plumbing, how many failures you've had, and what's above the leak.

1. 1Spot repair through the slab. Cut the flooring, break out a section of concrete, expose the line, repair it, patch back. Least invasive when the pipe is otherwise in good shape and this is a one-off. Worst option if the pipe is old and this is the third pinhole in two years — you're just picking the next hole's location.
2. 2Reroute. Abandon the failed run in the slab and run a new line overhead through the attic and down the walls. No concrete work. Very often the smart play when the leak is in a bad spot or the run is short.
3. 3Repipe. Replace the home's supply lines entirely, typically overhead. This is what you do when the underslab plumbing has demonstrated that it's finished — repeat failures, aging copper, systemic pinholing.

What your insurance will and won't do

Read your policy, not this paragraph — but the pattern is consistent enough to warn you about. Homeowners policies commonly cover the resulting damage from a sudden leak (the flooring, the drywall, the cabinets, sometimes the cost of accessing the pipe) and commonly do not cover the pipe itself, or damage from a leak that's been slowly seeping for months. Which is the entire argument for catching it early: the longer it runs, the more it looks like maintenance you neglected instead of a sudden loss.

Not sure what you're hearing? Let us find out

If your meter is spinning with the water off, or there's a warm patch on the floor you can't explain, don't sit on it. Wright Way Services locates and repairs slab leaks throughout Newnan and Coweta County, and we're available 24 hours. Call (770) 301-4638 and we'll find it before it finds your floors.