A slab leak is a break in a water line that runs under or inside the concrete floor of a home. Signs often start small, such as a warm patch of floor or the sound of running water when everything is off, and they turn expensive fast. Treat active signs as an emergency and call the 24/7 line for a same-day visit when available.
While you wait, shut off the main water valve and keep furniture off wet flooring. Then call (805) 249-7135 and mention any warm spots, damp baseboards or an unexplained bill increase.
Signs of a slab leak
- A warm or hot spot on tile, laminate or concrete, often from a hot water line leak.
- The sound of water running or hissing when every fixture is off.
- A meter that keeps moving with the house shut down.
- Damp carpet, lifted flooring, cracked grout or baseboards swelling from the bottom.
- A sudden drop in hot water pressure or a water bill that jumped without explanation.
Not every one of these means the slab. Roof, wall and drain leaks can look alike, so confirming comes first. Our leak detection page explains the testing that comes before any slab work.
Why slab leaks happen
Slab lines fail for a few well-known reasons. Copper can corrode from the outside where it contacts concrete or soil and from the inside where water chemistry and flow wear the wall. Movement from settling or earthquakes can rub a pipe against rock or rebar. High water pressure strains old joints.
Lompoc sits in a seismically active part of the Central Coast, and the city felt a strong earthquake in November 1927 that damaged chimneys and cracked highways. Ground movement over decades is a reason pipes in a slab deserve attention, and it is why we check pressure on every slab call. The city's 2025 report lists average hardness near 293 ppm, and scale on interior pipe walls can add to wear over many years.
Slab leak emergency under your floor?
Call now. The 24/7 line books a detection visit and tells you what to shut off.
How we locate a slab leak
Locating is non-invasive. We isolate the hot and cold lines, pressure test each and listen along the floor with acoustic equipment. Thermal imaging adds a second view of warm lines. The goal is to open as little concrete as possible, ideally one small square directly above the break.
If the leak is on a drain line rather than a supply line, a sewer camera can confirm it. That route leads to sewer line repair instead.
Repair options compared
| Option | Best for | Trade-off |
|---|---|---|
| Spot repair through the slab | One failed section in good pipe | Opens a small area of floor and concrete |
| Reroute through the attic or walls | Several leaks or inaccessible lines | Walls and ceilings are opened instead of the floor |
| Full repipe | Pipe failing in many places | Highest upfront cost, longest lasting |
| Epoxy or pipe lining | Some pipe conditions | Depends on pipe size and access |
We explain each option and what it means for your floor covering before work starts. If pipes are failing throughout the house, see repiping for the whole-system answer.
Water damage and the insurance conversation
Policies differ, but many homeowner policies cover water damage that results from a sudden leak and may not cover the cost to repair the pipe itself. Take photos of damage and keep receipts. Your insurer will decide what is covered.
We provide a written description of what was found and where, which supports a claim. We do not handle the claim for you. Call (805) 249-7135 before moving damaged flooring if you can, so the evidence stays intact.
What to do when you suspect a slab leak
- Close the main valve if you hear water running or see wet flooring.
- Do not walk barefoot on warm spots, because a hot water line may be leaking beneath.
- Move rugs and furniture off damp flooring and run fans to start drying.
- Do not drill or cut into the slab yourself.
- Note the meter reading and the time, then call for a detection visit.
What affects the price of slab leak repair
You get a clear price before work starts. Many Lompoc homes are not on slabs, so we confirm the foundation type on the call. Santa Maria homeowners can read our Santa Maria plumber page for coverage there.
Slab Leak Repair questions, answered
Yes. The line is open 24/7. Same-day visits are booked when availability allows, and we advise on shutting the main valve first.
Warm spots, running-water sounds and a moving meter point to supply lines. Gurgling and slow drains point to drain lines. A pressure test and camera separate the two.
Usually one small opening above the exact break, or none if we reroute the line through walls or the attic.
Often the water damage is, and the pipe repair itself may not be. Your policy decides. Keep photos and receipts.
A single accessible spot repair can often finish in a day. Rerouting and repiping take longer.
Permit rules vary, so ask the City of Lompoc building division. Additions or relocations of water lines always require one according to the city.