Leak Detection & Repair
Find the hidden leak before you open the wall — acoustic, thermal and pressure diagnostics, then a proper repair.
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Artisan Water Group
Slab Leak Repair in Lake in the Hills, IL
A slab leak is a supply or drain line failing underneath a concrete floor. It is the most anxiety-inducing category of plumbing problem, because the pipe is inaccessible and every proposed fix seems to start with a jackhammer.
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It does not have to. Locating precisely is most of the job, and there are usually two or three ways to fix a confirmed slab leak — only one of which involves opening the floor. Which one is right depends on where the leak is, what the pipe is made of, and how many other failures the same run has had.
Most homes in Lake in the Hills have basements, so true slab leaks are less common here than in slab-on-grade regions. Where we do find them is in slab-on-grade additions, attached garages converted to living space, lower-level bathrooms poured into a slab, and the occasional ranch built without a basement.
Signs of a leak under the slab
Slab leaks announce themselves indirectly. Recognising the pattern early is what keeps the repair small.
A warm spot on the floor
The classic hot water slab leak sign. Pets often find it before people do. On a tile or vinyl floor over a slab it can be quite distinct.
The sound of running water with everything off
Put an ear to the floor in a quiet house. A pressurised leak under concrete is often audible before it is visible anywhere.
A water bill that jumped with no explanation
Same household, same habits, much bigger number. Confirm it with the meter test — shut everything off and watch the low-flow indicator.
Damp carpet, cupping flooring or efflorescence
White chalky deposits at the base of a wall, flooring lifting at the seams, or a patch of carpet that never quite dries.
Pressure that drops or takes time to recover
A meaningful loss of system pressure with no visible leak anywhere is a strong indicator that the water is going under the floor.
A musty smell with no visible source
Moisture under a slab feeds mould in the flooring assembly above it long before anything shows on the surface.
How we handle a suspected slab leak
The goal is always to open the smallest possible area of concrete, or none at all.
1. Confirm there is a leak at all
Meter test, then isolate the system section by section under pressure. Plenty of suspected slab leaks turn out to be a running toilet or a failing water heater, and it costs nothing to rule those out first.
2. Determine hot side or cold side
Isolating the water heater and re-testing tells us which line is losing. That halves the search area before any equipment comes out.
3. Locate acoustically and thermally
Ground microphones hear pressurised water escaping under concrete. Thermal imaging shows the heat signature of a hot line leak through the floor. We want two methods agreeing before anyone marks the slab.
4. Present the repair options honestly
Spot repair through a small opening, rerouting the line overhead or around the slab, or repiping the affected run. Each has a different cost and a different disruption profile, and the right answer is not always the cheapest one today.
5. Execute cleanly
If we open concrete, it is a contained cut with dust control, the repair is made in accessible fashion, and the slab is patched properly. If we reroute, the abandoned section is capped correctly.
6. Pressure test and document
System back up slowly, held and verified. Photographs and a written cause-of-loss description for your insurer, because sudden slab leaks are frequently a covered claim.
Repair, reroute or repipe?
Three real options, and the honest answer depends on the pipe's history rather than on what is easiest.
A spot repair opens a contained section of slab, fixes the failure, and patches. It is the least expensive option and the right one for a single isolated failure in otherwise sound pipe — a nail through a line during a renovation, or a fitting that failed on its own.
A reroute abandons the under-slab section entirely and runs a new line overhead or around the perimeter. It costs more and it means some drywall work, but the pipe is then accessible forever. This is usually the right call when the leak is in an awkward location or when the slab run is long.
A repipe replaces the whole distribution system, and it becomes the rational choice when a house has produced multiple slab leaks. At that point the pipe is telling you something. Our whole-home repiping page covers what that looks like.
Where slab leaks actually happen locally
Because almost every home in Lake in the Hills has a basement, the classic slab-on-grade scenario is uncommon here. The places we do find under-slab failures are specific.
Additions poured on grade — a family room or sunroom added behind an existing house, with a bathroom or wet bar plumbed into the new slab. Converted garages, where a slab that was never intended to carry plumbing now does. Lower-level bathrooms where the drain and supply were cut into the basement floor. And radiant floor heating loops, which are their own diagnostic problem.
In all of those cases, the pipe is generally younger than the house and the failure is more likely to be installation-related or damage-related than age-related — which is good news, because it usually means one repair rather than a systemic problem.
What slab leak work costs depend on
Detection and repair price separately, because until it is located nobody can honestly quote the fix.
- How hard it is to locate
- A hot water line under an open tile floor is a comparatively fast find. A cold line under a finished basement with carpet, furniture and a dropped ceiling takes longer.
- Spot repair versus reroute
- Opening the slab once for a single failure is often cheapest. Rerouting the run overhead costs more up front and takes that pipe out of the slab permanently.
- How many leaks the run has had
- One failure is an incident. A second on the same run means the pipe is failing generally, and continuing to patch it is the expensive path.
- What is on top of the slab
- Vinyl and carpet are straightforward. Tile, hardwood and polished concrete all add restoration cost that has nothing to do with the plumbing.
- Depth and pipe material
- Copper repairs cleanly. Older galvanised under a slab is usually a reroute conversation rather than a repair one.
- Restoration scope
- We patch the slab. Replacing the finished floor over it is usually a flooring contractor's work, and we will say so up front rather than surprising you.
If we cannot locate the leak, we tell you that instead of charging you for exploratory demolition and hoping.
Slab Leak Repair FAQs
How do I know if I have a slab leak?
Shut off every fixture and watch the water meter's low-flow indicator for fifteen minutes. If it moves, you have a leak somewhere. A warm spot on the floor, the sound of running water in a quiet house, or unexplained damp flooring point specifically at the slab.
Do you have to break the concrete to fix it?
Not always. Rerouting the affected line overhead or around the slab avoids opening the floor entirely and is often the better long-term answer. When we do cut, it is a contained opening at a confirmed location, not exploratory demolition.
Does homeowner's insurance cover a slab leak?
Policies commonly cover the resulting water damage and the cost of accessing the pipe, while excluding the pipe repair itself. Terms vary a great deal. We document the failure with photographs and a written cause description you can give straight to your adjuster.
Is a slab leak an emergency?
It is urgent rather than instant. Water under a slab undermines soil and feeds mould in the flooring above, so it should not wait weeks. If it is a large-volume leak, shut the main and call — see our [emergency plumbing](/services/emergency-plumbing-lake-in-the-hills) page.
Can a slab leak be in the drain line rather than the supply?
Yes, and those are harder to find because they only leak when something upstream is draining. They usually present as damp flooring or a sewer smell rather than as a pressure loss, and they need a camera rather than acoustic detection.
Often needed together
Related plumbing services
These come up on the same houses more often than not.
Whole-Home Repiping
Copper and PEX repipes for galvanized and failing systems — planned in phases so your water is back on every night.
Learn more24/7 24/7 Emergency Plumbing
A real person answers, a licensed plumber rolls, and you get the price before any work starts — nights, weekends and holidays included.
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Worth reading first
More on this from our blog
Emergency5 min readHow to Shut Off Your Water in a Plumbing Emergency (Step by Step)
The five minutes between a pipe failing and the water stopping determine whether you have a repair or a remediation. Here is how to win those five minutes.
Homeowner Guides6 min readPlumbing Problems Common in 1990s-Built Lake in the Hills Homes
When a whole subdivision goes up in three years, its plumbing ages out in three years too. If your neighbours are replacing water heaters, you are on the same clock.
Slab Leak Repair
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- 5.0 from 11 Google reviews
- Licensed & insured
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Why homeowners choose us for this
We are a licensed, insured, owner-operated shop based on Pine Street in Lake in the Hills. That means the person quoting the job is the person doing it, and nobody here is measured on how much they sold you.
Every recommendation starts with the water. At 26–28 grains per gallon, our supply is roughly six times harder than the national average, and it is the single biggest factor in how long anything in your plumbing lasts. Fixing the symptom without addressing that is how you end up calling someone again in two years.
And when a permit is required — water heaters, sewer work, gas piping — we pull it and show the fee on its own line. Ask every plumber you talk to for the same. Read more in our guide to plumbing permits in McHenry County.