What is slab leak detection? It’s a set of non-destructive tests a plumber uses to confirm there is a leak under the concrete slab, identify whether it’s on the hot or cold line, and locate it closely enough to plan the repair. The usual tools are a meter test, pressure testing, acoustic listening equipment, thermal imaging and electronic pipe locating.
Detection is the first step in any slab leak repair in Greenacres. Skipping it leads to guesswork, like opening a floor in the wrong place or replacing pipe that was fine. A good detection visit ends with a clear answer: where the leak is, which line it’s on, and what repair options make sense.
How a plumber finds a leak under the slab
- Confirm water is being lost. With every fixture off, the plumber watches the water meter. Movement means water is escaping somewhere between the meter and the fixtures.
- Rule out the obvious. Toilets that silently refill, a dripping irrigation valve or a leaking water heater relief valve can all move the meter. These are checked first.
- Separate outside from inside. Closing the main valve at the house shows whether the loss is in the buried service line from the meter or inside the home’s plumbing.
- Isolate hot versus cold. Shutting the water heater’s supply and pressure-testing each side shows which system is losing pressure. Hot-side leaks are common and often cause warm floors.
- Pinpoint the location. Acoustic listening devices pick up the sound of water escaping under pressure through the concrete. Thermal imaging can show heat patterns from hot-water leaks, and a line locator traces the pipe’s path so the search stays on the right route.
- Mark and report. The plumber marks the suspected leak on the floor and explains what they found. Ask for a written report if you plan to involve your insurer. Our Florida slab leak insurance guide explains why it matters.
Detection tools and what each one tells you
| Method | What it shows | Limits |
|---|---|---|
| Meter test | Whether water is being lost at all. | Doesn’t show where. |
| Pressure / isolation test | Which line or zone (hot, cold, a specific branch) is leaking. | Needs working shutoff valves to isolate sections. |
| Acoustic listening | The sound of pressurized water escaping, used to narrow the location. | Background noise and thick flooring can make it harder. |
| Thermal imaging | Warm areas on the floor from hot-water leaks. | Much less useful for cold-water leaks. |
| Line locating | The route the pipe takes under the slab. | Traces the pipe, not the leak itself. |
| Tracer gas (some providers) | A safe gas pushed through the line escapes at the leak and is detected at the surface. | Specialized equipment; not every provider uses it. |
Not every visit uses every tool. The plumber picks the ones that fit what the first tests show.
When to book detection
- Your meter test showed movement with everything off.
- Your Palm Beach County Water Utilities bill rose sharply without a change in usage.
- You’ve found a warm, damp or discolored patch of floor.
- You can hear water running inside a wall or under the floor.
- You’re buying a home and want peace of mind about hidden leaks before closing.
What happens after the leak is found
Once the location is known, the conversation turns to the repair. If the floor above is simple to replace and the pipe is otherwise sound, a targeted spot repair through the slab may be the quickest fix. If the leak sits under expensive tile, or the line has leaked before, the provider may suggest a reroute that bypasses the old pipe. When detection turns up several weak points, a whole-house repipe may be the more durable answer.
Homeowners in Wellington and Royal Palm Beach go through the same detection process. The difference is mainly which utility’s meter and bill you’re reading.
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Frequently asked questions
How long does slab leak detection take?
Many detection visits take a couple of hours, but it depends on the home’s layout, how many lines need isolating and how easy the leak is to hear. The provider can give you a better estimate after hearing your symptoms.
Will detection damage my floor?
No. Detection uses meters, gauges, listening devices and cameras from the surface. The floor is only opened later if you choose a spot repair.
Can I find a slab leak myself?
You can confirm a leak with a meter test and look for warm or damp spots, but pinpointing the location usually needs professional acoustic and pressure-testing equipment.
Is leak detection a separate charge from the repair?
Often, yes. Many providers price detection separately. Ask the provider you’re connected with how they charge and whether the detection fee changes if you go ahead with the repair.
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