Leak Detection in Houston

Most Houston homes sit on a slab-on-grade foundation poured directly over gumbo clay — which means your water lines run under the concrete you walk on, and the clay under that concrete swells and shrinks with every wet spring and dry August. When a pipe finally gives, the leak hides where you can't see it. Finding it precisely, before anyone touches a jackhammer, is the whole job. That's what we do.

How do you find a leak without tearing up the house?

The old way was to guess where the leak probably was and start opening floors until someone found water. The modern way is to make the pipe tell you. Since 1987 we've built our leak work around three non-invasive diagnostics, used in order:

• Pressure testing and line isolation. We valve off sections of your supply system and watch gauges. This tells us which line is losing water — hot or cold, which branch — before we hunt for where.
• Acoustic listening. A pressurized leak under a slab has a signature sound. Ground microphones and amplification let us trace that sound across the floor and mark the leak's position from above, usually within a foot or two.
• Camera inspection. Where there's pipe access — drains, cleanouts, larger supply work — a camera confirms what the pipe wall actually looks like. The camera footage tells the truth, and you watch it with us.

Only after those three agree do we mark a spot. And even then, opening the slab is one option among several — on many slab leaks, rerouting the line overhead beats cutting concrete entirely.

What are the warning signs of a hidden leak?

Slab leaks and in-wall leaks rarely announce themselves with a puddle. They announce themselves sideways:

• A water bill that jumps with no change in how you live
• A warm spot on the floor — the classic hot-line slab leak signature, often first noticed barefoot
• The water meter spinning with every fixture in the house off
• The sound of running water when nothing is running
• Mildew smell, cupping wood floors, or baseboards pulling away from the wall
• Low water pressure at fixtures that used to run strong
• New hairline cracks in tile or drywall — water eroding clay under one corner of a slab moves the foundation unevenly

Two of those together justify a diagnostic visit. If you want the full picture of why our soil does this to our pipes, we wrote it up in detail: Why Houston's Clay Soil Causes Slab Leaks — and the Warning Signs Homeowners Miss.

Matching the symptom to the leak

No table replaces testing, but symptoms do cluster. Here's how we read them when you call:

Why guess-digging is the expensive way to find a leak

Every so often we're called to a home where someone has already opened three holes in a terrazzo floor — and the leak was under the fourth spot. Exploratory demolition is the worst of both worlds: you pay for the digging, you pay to repair the finishes, and none of it moved you closer to the answer. In the older housing stock of River Oaks, West University, Montrose, and the Heights, the finishes being destroyed — original hardwoods, period tile — are often irreplaceable.

Precision costs less than demolition. That's not a slogan; it's arithmetic. One marked location means one opening, or none at all if a reroute makes more sense.

What a diagnostic visit actually looks like

A master plumber arrives with the listening gear, gauges, and camera on the truck — not a salesman who schedules a second trip. The sequence: we confirm the loss at the meter, isolate lines until the gauges point at one, trace it acoustically, and mark the location on your floor in front of you. Then we sit down and walk through the options — spot repair, reroute, or, if the system is failing generally, a conversation about repiping — each with a fixed written quote. No number changes after the work starts, because the diagnosis already did the hard part.

You keep the report either way. Some homeowners take it to their insurance adjuster; some take it to another plumber for a second bid. Both are fine with us. Evidence travels well.

Slab leak confirmed — spot repair, reroute, or repipe?

Once the leak is marked, you have three honest options, and the right one depends on the pipe's overall condition — not on which one a contractor prefers to sell.

• Spot repair. Open the slab at the marked location, fix the failed section, close it up. The right call when the system is otherwise healthy, the leak is a one-off — a nail strike, a single bad joint — and the flooring above is replaceable. Its weakness: it fixes one point on a line that shares age and water chemistry with every other point on that line.
• Reroute. Abandon the failed under-slab segment entirely and run a new line overhead through the attic and walls. No concrete cut, no jackhammer over your terrazzo — which is why it's often the answer for hot-side leaks (the most common kind) and for any line that has now failed twice. A reroute typically costs more than a simple spot repair, and buys you a line you can actually reach next time.
• Repipe. When this leak is the third one, or the pipe is polybutylene or end-of-life galvanized, spot fixes become a subscription. That's the point where the honest conversation is a whole-home repipe — a bigger number once, instead of a smaller number annually plus the damage each event leaves behind.

Neighborhood matters here more than most homeowners expect. The long, low slab ranches of Memorial — where slab leaks are practically the signature plumbing problem — have under-slab runs long enough to make reroutes attractive. Similar-era slab homes in Tanglewood and Bellaire face the same math. We lay out every option that genuinely fits, each with a fixed written price, and tell you plainly which one we'd choose in our own house.

What do leak detection and slab leak repair cost in Houston?

Two separate numbers, and keeping them separate protects you. The diagnostic visit — the finding — is one price; the repair is its own decision with its own price, and the diagnosis never commits you to it. As market context for Houston, typically:

What moves a repair within those ranges: how deep the line sits, what's on top of it — tile and terrazzo cost more to open and restore than carpet — how far the failure is from an access point, and whether the water has already done damage that needs drying before anyone can work. Those are market figures, not quotes. Ours works one way only: after the diagnostic, you get a fixed written price for each option on the table, and the number you approve is the number you pay. Nothing changes after the work starts, because the diagnosis already did the hard part.

Water-bill forensics: finding a leak in your City of Houston bill

Your water bill is a leak detector you already pay for — most homeowners just never read it as one. City of Houston bills show consumption in gallons for each billing period, with your recent usage history alongside. Three things to check:

1. Compare against yourself, seasonally. Set this month against the same month last year, not against last month — Houston usage swings with irrigation season. Same house, same habits, same month, thousands of gallons higher: that gap has a source.
2. Know your baseline. A typical person uses roughly 50–100 gallons a day indoors, so a family of four with no irrigation generally lands somewhere around 6,000–12,000 gallons a month. A bill running far above that with no sprinkler system deserves an explanation.
3. Watch the trend, not one spike. One high bill can be a misread or a houseguest month. Two or three climbing in a row while nothing changed is the classic slab-leak signature. (A spike in the period right after a hard freeze is its own red flag — February 2021 taught the whole city that lesson, and our freeze-prep guide covers the prevention side.)

Then confirm at the meter. The sixty-second test:

1. Turn off every fixture and water-using appliance — including the ice maker and irrigation controller.
2. Open the meter box at the curb and find the low-flow indicator: a small triangle, star, or dial that spins with even a trickle.
3. Watch it for a full minute. Movement with everything off means water is leaving the system somewhere.
4. Close your house-side shutoff valve and look again. Still moving? The leak is in the yard line between meter and house. Stopped? It's inside or under the slab.
5. One more clue: a water heater quietly firing when nobody has used hot water points at a hot-side slab leak — the same leak that shows up on your gas or electric bill.

One caveat worth knowing: the meter only sees pressurized supply water. A leaking drain line never moves the meter and never raises the bill — it shows up as odor, damp, or recurring clogs instead, and finding it is camera work, not meter work. Either way, bring us your observations — billing history, meter behavior, which valve stopped it — and you've already done the first hour of diagnosis before we ring the doorbell.

A word on urgency, since bills lag reality by a month: the meter test is the real-time instrument, and the bill is the historian. If the meter is moving with everything off, don't wait for the next billing cycle to confirm what you already know — a pressurized leak runs around the clock, and under a slab it's soaking clay the whole time. Book the diagnostic. If the meter is still and the bill was a one-month blip, watching one more cycle is a perfectly reasonable, cheaper choice — and we'll tell you so on the phone rather than sell you a visit you don't need yet.

Leak Detection FAQ

How long does a leak detection visit take?

Most residential leak detections take two to four hours. A straightforward fixture or wall leak can be pinned down faster; a slab leak in a larger home with long under-slab runs takes longer because we isolate lines, pressure-test each one, and confirm the location acoustically before marking it. You get the findings and a fixed written quote before we leave.

Will you have to break my slab to find the leak?

Not to find it. Acoustic listening, line isolation, and pressure testing locate the leak from above the slab, and a camera confirms condition where there is pipe access. Opening the slab only happens if you choose a direct spot repair as the fix — and only at the marked location, not exploratory digging. Rerouting the line often avoids opening the slab at all.

Does homeowners insurance cover slab leak repairs in Houston?

It depends on your policy. Many Texas policies cover the access and the resulting water damage but not the plumbing repair itself, and coverage for gradual leaks varies. We document everything — test results, location, footage where available — in a written report you can hand straight to your adjuster. Read your policy or ask your agent before assuming either way.

What does leak detection cost in Houston?

In the Houston market, professional electronic leak detection typically runs in the low hundreds of dollars, depending on home size and how many lines need isolating. We quote the diagnostic as a fixed price before we start, and the repair — whatever the findings — gets its own fixed written quote. You are never committed to the repair by the diagnosis.

How do I test my water meter for a hidden leak?

Turn off every fixture and appliance, open the meter box at the curb, and watch the low-flow indicator — the small triangle or dial — for a full minute. If it moves, water is leaving the system. Close the house-side valve and look again: still moving means a yard-line leak; stopped means the leak is inside or under the slab. Tell us which when you call.

Can a slab leak damage my foundation?

It can. A pressurized leak under the slab feeds moisture into the clay beneath it, and Houston's gumbo clay swells where it's wet and shrinks where it isn't — so one saturated corner moves differently from the rest of the house. That's why new drywall cracks and sticking doors sometimes accompany a leak. Finding it early is foundation protection as much as plumbing repair.