A slab leak is a failure in a water supply line running beneath the concrete slab the house sits on. It matters as a separate category because the water has nowhere visible to go. It tracks sideways through the fill under the slab, sometimes for weeks, before anything shows on the surface.
By the time most people notice, it has been running a while. That's not carelessness, it's the nature of the problem.
The meter test. Turn off every fixture and appliance that uses water, then watch the meter. Movement means water is escaping somewhere. It costs nothing and it's the most useful single fact you can give us.
How a slab leak announces itself
- A warm or hot patch on the floor. The clearest sign there is, and it means the hot line.
- The sound of running water with everything turned off.
- A water bill that jumped with no change in household use.
- Pressure down throughout the house.
- Damp carpet, lifting tiles or blistering paint at floor level.
- A musty smell in one part of the house.
- New cracks in floors or walls, in longer running cases where soil has been washed out.
Finding it without demolition
The expensive way to find a slab leak is to break concrete where you think it might be. We don't do that.
- Confirm and isolate. Establish it's a supply leak rather than drainage or irrigation, and pressure test to bound it.
- Acoustic location. Water escaping under pressure makes a distinctive sound that specialist equipment tracks through the slab.
- Thermal imaging, especially effective on hot lines because the escaping water warms the concrete above it.
- Mark the location and talk through options before anything is opened.
Three ways to fix it
| Approach | When it fits | Trade off |
| Open and repair | Single leak, sound pipe, accessible spot | Breaks concrete and finishes, but repairs the original run |
| Reroute | Most slab leaks, especially under finished areas | Abandons the failed run, no concrete work, pipe runs overhead |
| Repipe | Multiple leaks, or poly B throughout | Largest job, ends the recurring problem |
Rerouting is often the sensible answer and it surprises people, because it feels like abandoning something. But opening a slab under a tiled kitchen to repair six inches of pipe, then putting the floor back, frequently costs more than running a new line through the attic and capping the old one.
When one leak means more are coming
A single failure caused by physical damage is bad luck. A failure caused by the age and material of the system is a preview. If the house has polybutylene, which is common in Tampa homes built between roughly 1978 and 1995, a slab leak is often the first of several, and the arithmetic shifts toward repiping rather than repeated repairs.
We'll tell you which of those situations you're in. Repairing one leak at a time on a system that's failing is the most expensive way to arrive at a repipe.
Why Tampa gets these
Slab construction dominates here, so there's simply more pipe under concrete than in regions that build over crawlspaces. Add a high water table that masks surface evidence, soil that moves with the seasons, and a large stock of homes with poly-B supply lines from the 1978 to 1995 window, and the result is that slab leaks are routine work in this city rather than an unusual event.