Signs of a Slab Leak in a Houston Home

A slab leak is a pressurized water line leaking beneath your home's concrete foundation — and the earliest signs are a jumping water bill, warm spots underfoot, and a meter that spins with every tap closed. Because the pipe is under concrete, you'll rarely see water first. You'll see the side effects.

What is a slab leak, exactly?

Most Houston homes are built slab-on-grade, with water lines run through or beneath the concrete. When one of those lines corrodes, rubs against rebar, or gets flexed by soil movement until it cracks, the water has nowhere to go but into the soil and slab — silently, at full line pressure, around the clock.

Why does Houston get so many slab leaks?

Our soil is the villain. Greater Houston sits on expansive clay — locals call it gumbo — that swells in wet springs and shrinks hard in August droughts. That seasonal heave flexes foundations and the rigid copper lines under them, year after year. Add the region's mineral-heavy water eating at pipe walls from the inside (see what hard water does here), and homes from the 1950s–1980s with original under-slab copper or galvanized lines become prime candidates.

The 7 signs worth checking tonight

1. A water bill that jumped with no change in household habits — the most common first clue.
2. The sound of running water when every fixture is off. Put your ear near floors and walls on a quiet evening.
3. Warm or hot spots on the floor. Hot-line slab leaks literally heat the concrete above them — tile and vinyl telegraph it best.
4. The meter test. Close every fixture, then watch your water meter for 15 minutes. Movement = something is flowing somewhere.
5. Damp carpet, cupped wood, or buckling laminate with no spill to blame.
6. A drop in water pressure at multiple fixtures at once.
7. New foundation symptoms — hairline cracks in drywall or tile, doors that suddenly stick. Long-running leaks soften the soil supporting the slab.

What happens during professional leak detection?

This is not a sledgehammer-first job. We use electronic acoustic listening gear, line pressure isolation, and thermal imaging to pinpoint the leak within inches — then open only what needs opening. You get the findings, the options, and written pricing before anything is cut.

Repair options, from least to most invasive

• Spot repair — open the slab at the leak and fix that section. Right answer for a young system with one bad spot.
• Reroute — abandon the leaking under-slab run and route a new line overhead through walls or attic. Often cheaper than breaking concrete, and it removes that line from under the slab forever.
• Repipe — when this is the third leak in five years, patching a failing system is throwing good money after bad. Our repiping guide covers what that involves and costs.

Catch it before it starts

Slab leaks announce themselves quietly, which is exactly why our VIP Home Protection Plan includes an annual multi-point inspection (a $350 value) — pressure checks and fixture-by-fixture review that catch the early signs while they're still cheap. Suspect something right now? Run the meter test above, then book a leak detection visit — we've been finding Houston's hidden leaks since 2007.

Quick answers from the crew