Reviewed by AJ Robles Owner & Licensed Master Plumber · LIC# RMP 46529 Updated June 25, 2026 Most homes across Greater Houston sit on a concrete slab, with water lines running through or beneath that foundation. When one of those lines springs a leak, it's called a slab leak — and because the water is hidden under the floor, it can do real damage before you ever see a drop. The good news: slab leaks give off warning signs, and caught early they're usually a targeted fix.
What is a slab leak?
A slab leak is a leak in a pressurized water line (or sometimes a drain line) located under your home's foundation. Houston's expansive clay soils, slab-on-grade construction, and older copper or galvanized plumbing all make our area more prone to them than most.
The warning signs
- A water bill that jumps with no change in how much you're using.
- The sound of running water when every faucet and appliance is off.
- A warm or damp spot on the floor (a hot-water-line leak you can sometimes feel).
- Low water pressure throughout the house.
- New cracks in flooring, tile, or walls as moisture moves the slab.
- A musty smell or mildew from moisture trapped under flooring.
One of these alone might be nothing. Several together mean it's time to shut your water at the main and call a plumber for leak detection.
How we find it (without tearing up your floor)
We start non-invasively. With careful leak detection — isolating fixtures and pressure testing the lines — we narrow down the leak area before we open anything. That means we fix the spot that's actually leaking instead of guessing and demolishing more of your home than necessary.
Your repair options for a slab-foundation home
Once we know where and why the line failed, you generally have three paths, and we'll explain the trade-offs of each:
- Spot repair — access and fix the single failed section. Best for a newer system with a one-off leak.
- Reroute — abandon the under-slab section and run a new line through the walls or attic, avoiding the foundation entirely.
- Repipe — for older homes with repeated failures, replacing the supply piping ends the cycle for good.
Why catching it early matters
A slow slab leak never gets cheaper by waiting. Left alone, it can erode soil and undermine the foundation, feed mold, and quietly run up your water bill for months. A fast leak — water actively pooling — should be treated as urgent: shut off the main and call us. Our repair team answers 7 AM – 7 PM, 7 days a week, so you won't wait until Monday.
Not sure what you're dealing with?
Send us what you're seeing and we'll tell you honestly whether it sounds like a slab leak or something simpler. If another company already quoted a major slab-leak repair, ask another licensed plumber for an independent assessment before you commit — see how to choose a plumber for what to look for.
Frequently Asked Questions
How do I know if I have a slab leak? +
Common signs are a water bill that jumps with no change in usage, a warm or damp spot on the floor, the sound of running water when every fixture is off, cracks in flooring or walls, and a drop in water pressure. If you see several of these, shut your water at the main and call a licensed plumber for leak detection.
Can a slab leak be fixed without breaking up my floor? +
Often, yes. We start with non-invasive leak detection to locate the problem area. Depending on the home and the pipe, options can include a targeted spot repair, rerouting the affected line, or — for older homes with repeat failures — a repipe. We'll explain the trade-offs before any work begins.
Are slab leaks an emergency? +
A slow slab leak isn't always urgent, but it never gets cheaper by waiting — and a fast leak can undermine your foundation and grow mold. If water is actively pooling or your bill spiked overnight, shut off the main and call us. We answer 7 AM – 7 PM, 7 days/week.