Slab-on-grade construction is the Peoria norm, so the water and sometimes the drain lines run inside or beneath the slab your house sits on. When a copper supply line pinholes down there, water has nowhere to go but into the concrete and the soil under it, and the first hint is often a hot patch on the floor or a bill that will not come down.
A slab leak is not a wait-and-see problem. Left alone it undermines the soil under the foundation and keeps the water heater cycling in desert heat. Located early, it is usually a contained repair rather than a major one.
Locating the line before touching the slab
We isolate the hot and cold sides, pressure-test to confirm which is losing, and use acoustic and thermal tools to walk the leak down to a point. Only then do we mark the floor. Opening concrete is the expensive part of any slab job, so the entire strategy is to open it once, in the right place.
Older central Peoria homes on soft sand and newer north-Peoria homes over caliche present different challenges once we are in the slab, and knowing the soil going in changes how we plan the access and the patch.
Repair, reroute, or repipe
For a single break in otherwise sound copper, a spot repair at the located point is often enough. When the same line has failed before, or the copper is thinning from years of very hard, scaling water, rerouting that run overhead through the attic or walls avoids ever opening the slab there again.
If several lines are failing, we will say so honestly and price a partial or whole-home repipe against the cost of chasing leaks one at a time. Very hard water and decades of heat are hard on original copper, and at some point new pipe is the cheaper answer.
| Approach | Best when | Trade-off |
|---|---|---|
| Spot repair | One break, sound pipe | Opens the slab at one point |
| Overhead reroute | Repeat break on one run | Avoids the slab, adds accessible pipe |
| Partial repipe | Two or three failing runs | More work now, fewer callbacks |
| Whole-home repipe | Widespread thinning | Largest job, ends the cycle |
What to do if you think a slab leak is active
A fast slab leak can move a surprising amount of water before it surfaces.
- Shut the main and note whether the meter stops, which confirms it is on the supply side
- Keep the affected area dry and clear so we can read the floor
- Do not run the water heater dry if the leak is on the hot side
- Photograph any new floor cracking or tile lifting for reference
Frequently asked questions
How do I know it is a slab leak and not something else?
The tell-tale combination is a warm floor spot on a hot line, a meter that moves with everything off, and sometimes new cracking in tile or grout. We confirm it with a pressure test before recommending any concrete work.
Will you have to jackhammer my whole floor?
Almost never. Once the leak is located we open a single access point. When a run has failed repeatedly, an overhead reroute avoids opening the slab there at all.
Does hard water cause slab leaks in Peoria?
It contributes. Very hard, mineral-heavy water and decades of desert heat thin and stress copper over time, which is why original copper in older homes eventually starts pinholing under the slab.
Is a slab leak covered by insurance?
Policies vary, and coverage often applies to the resulting water damage more than the pipe itself. Keep our located-leak documentation and photos, and check your specific policy with your carrier.
Reviewed by the Peoria AZ Plumbing Co team. Our work follows the International Plumbing Code (IPC) and the International Fuel Gas Code (IFGC) as adopted regionally, plus the permit and inspection requirements of the City of Peoria and Maricopa County.