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Leak Detection Services in Houston/
Slab Leak Detection in Houston
Slab Leak Detection in Houston
A slab leak is a leak in a water or drain line that runs under the concrete foundation. It matters here because so much Houston housing is slab on grade, and because water under a slab affects the soil the foundation sits on.
Warning signs
A warm spot on the floor, which usually means the hot water line
Carpet, wood or tile that is damp with no source above it
The sound of running water with every fixture off
Water bill increase with no change in habits
A section of floor that is buckling or tile that has started cracking in a line
Musty smell that comes back after cleaning
Pooling water at the edge of the foundation or along a patio slab
Why Houston soil makes this worse
Much of the Houston area sits on expansive clay soil that swells when wet and shrinks when dry. That movement is already hard on foundations during a normal cycle of drought and heavy rain. Adding a constant water source under one part of the slab adds movement where you do not want it.
That is the practical reason not to wait on a suspected slab leak. The plumbing repair is one problem. Saturated soil under a foundation is a more expensive one.
The cycle here is seasonal. A long dry stretch pulls moisture out of the clay and it contracts; a wet period puts it back and the clay swells again. A line that runs through that movement year after year is the one that eventually gives at a joint or a thin spot.
Not every home in the area is built on a slab. Pier and beam construction is common in the older inner neighborhoods, and a leak under a raised floor is a different job with different access. If you are not sure which you have, say so in the request and let the provider work it out on site.
Supply line or drain line
The two behave differently, and the difference changes what happens next. A pressurized supply line under the slab leaks continuously, whether or not anyone is using water, so it registers at the meter and eventually on the bill. If it is the hot side, that is the one that warms a patch of floor.
A drain line under the slab only leaks while something upstream is draining. It will not move the meter and it will not warm the floor. It tends to show up as a damp or musty patch that comes and goes, and it is usually chased with a camera or a pressure test on the drain system rather than at the meter.
Checking the meter yourself
Shut off every fixture and appliance that uses water, including the ice maker and the irrigation system, then look at the meter. Most have a small leak indicator, a triangle or a dial, that turns whenever water is moving. If it is still turning with everything off, water is going somewhere.
That tells you there is a leak. It does not tell you the leak is under the slab and it does not locate it. A toilet flapper that is passing water, a dripping hose bib or an irrigation valve that is not seating will all do exactly the same thing, so it is worth ruling those out before assuming the worst.
Why catching it early matters
Water travels along the pipe trench, so by the time it surfaces it can be well away from the actual break.
Saturated clay under one part of a slab moves differently from the drier clay under the rest of it.
Flooring, baseboards and the bottoms of cabinets take up water long before anyone sees a puddle.
A musty smell that keeps coming back after cleaning usually starts with a damp slab under the flooring.
The plumbing repair is rarely the expensive part. Drying, flooring and any foundation work that follows is.
If you expect to make an insurance claim, photographs and dates taken early are worth having.
What assessment involves
The work starts with confirming there is a leak at all, usually with a meter check and by isolating the hot and cold sides. From there a plumber narrows the location as far as possible before anything is opened.
This site does not claim which locating equipment any given provider uses. Ask before work begins how the location will be confirmed, what will be opened, and what the plan is if the leak is not where it was expected.
Depending on the property and on what those first checks show, the work may then involve any of the following.
Isolating the hot and cold sides so the loss can be attributed to one of them
A pressure test on the section under suspicion, to see whether it holds
Acoustic listening equipment, which picks up the sound of water escaping under concrete
Thermal imaging, which can show a warm line beneath a floor where a hot water leak is running
Line tracing or tracer gas to narrow the position before anything is opened
A camera on the drain side, where the suspected leak is a drain line rather than a supply line
Repair options
Open the slab at the leak and repair the line in place
Reroute that section overhead through walls and the attic
Repipe the run if the same line has failed more than once
Who does this work
Houston Plumbing Solutions does not perform leak detection and does not own locating equipment. We publish this so you know what to expect and what to ask about. Service requests sent through this site are passed to independent plumbing companies working in the area. The provider does the detection and the repair, sets the price and is responsible for the work.
How this site works →Questions people ask us
What is a slab leak?
A leak in a pressurized water line or a drain line that runs beneath a concrete foundation. Because the pipe is under the slab, the water has nowhere obvious to go, so it saturates the soil, travels along the pipe trench and often surfaces far from the actual break.
Is a warm floor always a slab leak?
No. It is a common sign, and it points at the hot water line, but heated flooring, sun exposure through a window and duct routing can all warm a floor. Treat it as a reason to check the meter rather than a diagnosis.
Can a slab leak damage my foundation?
Continuous water under a foundation changes the moisture content of the soil supporting it, and the clay soils common in this area move as moisture changes. Whether a specific slab leak has caused foundation damage is a question for inspection, not a web page, which is why early assessment is the point.
How do I tell a slab leak from a leaking fixture?
Often you cannot, from the outside. A running toilet, a dripping hose bib or an irrigation valve that is passing water all move the meter the same way a slab leak does. Rule out the visible things first. If the meter is still turning after that, something hidden is running, and where it is running is the question a provider answers on site.
Will a slab leak show up on my water bill?
It can, and an unexplained increase with no change in habits is one of the more common first signs. But a slow leak may not move the bill by much, and the bill arrives weeks after the leak started. A normal bill is not evidence that nothing is wrong.
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