Almost every home in San Tan Valley is built slab-on-grade, with the water lines run in or under the concrete. When one of those lines starts leaking, the water has nowhere to go but sideways and up, which is why the first sign is often a warm spot on the floor, a section of tile that never feels cool, or a water bill that climbed for no reason you can point to.
A slab leak is not something to locate by opening concrete and looking. It is located from the surface first, then opened in exactly one place. That is the whole difference between a targeted repair and a demolished floor.
Signs you are looking at a slab leak
These are the symptoms that bring most slab-leak calls in, and any two of them together are worth a look.
- The sound of running water when every fixture is off
- A warm patch on the floor, usually a hot-side line
- The water meter creeping even with the house shut down
- Unexplained damp along a baseboard or the edge of a room
- A spike in the EPCOR or Arizona Water Company bill with no change in use
The meter test is the quickest confirmation you can do yourself: shut off every fixture, read the meter, wait an hour without using water, and read again. Movement means water is leaving the system somewhere, and under a slab is a common somewhere.
Why these lines fail in newer homes
A lot of San Tan Valley went up quickly in the last twenty to twenty five years, and a common failure we find is kinked or stressed PEX-B tubing at a stub-out, under a vanity or behind a kitchen island, where the line was bent tight during construction. The kink does not leak on day one. It fatigues at the bend over years and finally weeps, which is why a ten-year-old house can develop a slab leak that a homeowner assumes only happens to old plumbing.
Hard water plays a part on the hot side. Water here runs roughly 16 to 20 grains per gallon, and hot water carrying that mineral load is hard on copper, which is one reason hot-side pinhole leaks show up. If the leak is one symptom of a line that is failing in more than one place, a whole-home repipe can be the more honest fix than chasing individual spots.
Spot repair or reroute: how the call goes
Once the leak is located, there are two honest ways to fix it, and the right one depends on the line.
| Approach | When it fits | What it involves |
|---|---|---|
| Spot repair | A single, accessible leak in an otherwise sound line | Open the slab at the located point, repair the section, and close it back up |
| Overhead reroute | A hot-side line that has failed once and is likely to again | Abandon the under-slab run and route new PEX-A overhead through the attic, no more concrete opened later |
We locate first with acoustic and thermal equipment, mark the exact spot, and only then recommend one path or the other. You should never be quoted a reroute before the leak has actually been found.
Meter still moving with the water off? That is water you are paying for by the hour. Call and we will locate it.
Call (520) 347-8179What a slab leak often travels with
A slab leak rarely arrives alone. The water that escapes under the concrete usually shows up first as a symptom a homeowner spots elsewhere, which is why the same call often touches on whole-home leak detection to rule out a second source, and on water damage drying if the leak reached flooring or a wall before it was found. When the located leak is the second or third in the same piping, that pattern is the real signal, and a whole-home repipe retires the failure mode instead of patching it one spot at a time.
Questions we hear on this job
Can you find the leak without breaking up my floor?
Finding it, yes. We locate slab leaks from the surface using acoustic listening equipment and thermal imaging, which pinpoints the line before any concrete is opened. The only spot that gets opened is the one directly over the confirmed leak. The point of locating first is precisely to avoid exploratory demolition.
Is a warm spot on the floor always a slab leak?
Not always, but it is worth checking. A warm floor over a hot-water line usually means hot water is escaping under the slab. It can also be a recirculation line running normally, so we confirm with the meter and with listening equipment rather than opening the floor on the strength of a warm tile alone.
My house is only about ten years old. Why do I have a slab leak?
Because age is not the main driver here. Many local slab leaks trace back to PEX-B tubing that was kinked or over-bent at a stub-out during the original build, and that stress point fails years later. It is a construction-era issue as much as an age issue, which is why fairly new homes in the area are not immune.
Need a Slab Leak Detection & Repair in San Tan Valley?
Call and describe what is happening. You will reach a plumber, not a form.