Confirming it is a slab leak
Pressure testing separates the hot and cold sides and rules out irrigation, a fixture or a drain problem. A leak that turns out to be above the slab is a much smaller repair, so it is worth proving before anything else.
Slab Leak Repair
A warm patch of floor, the sound of running water with every tap closed, or a bill that climbed for no reason. San Antonio 24 Hour Plumber locates the line under the concrete first, then explains each repair route before any slab is opened.
- 24/7 Emergency Service
- Upfront Quotes
- Same-Day Availability
Signs That Need Attention
- A warm or hot spot on a tile or wood floor
- Running water audible through the floor at night
- Carpet or baseboards damp along one wall with no fixture nearby
- Hot water pressure that has dropped while cold stayed normal
- A new crack in flooring or a door that suddenly will not close
A warm spot usually means the hot water line, because that is the one you can feel. Cold-side leaks are quieter and often show up as damp flooring or a high bill instead. Either way the water is under the foundation, not on top of it, so mopping and drying does nothing and the problem carries on.
What the Service Includes
Every slab leak has more than one legitimate repair route, and they cost and disrupt differently. San Antonio 24 Hour Plumber puts the options in front of you rather than choosing one for you.
Pinpointing the position
Acoustic listening and line tracing fix the leak to a spot rather than a room. On a slab repair, an accurate location is the difference between one small opening and a floor that has been broken in three places.
Repair, reroute or repipe
Opening the slab at the leak, rerouting that line overhead through the attic and walls, or repiping the house are three real answers. Which is sensible depends on the pipe's age, how many leaks there have been and what is on the floor above.
Your Repair Options
Slab leaks are common here for a structural reason. Most San Antonio houses built from the 1970s onward in the north and west sit on post-tension or conventional slabs poured over expansive clay. That clay swells when it rains and shrinks hard through a dry summer, and the slab moves with it. Copper supply lines cast into or running under that concrete get flexed at every joint, year after year, until one gives. In the far north the ground is shallower over limestone, which moves less but is unforgiving on a line that rubs against rock.
A single leak in a system that has never given trouble is usually worth a spot repair. A second or third leak in the same house is a different conversation — at that point the line itself is telling you something, and rerouting that run or repiping is often the last repair you will pay for. Ask which of the three routes is being quoted and why.
Before the repair there is the finding, which is covered under leak detection. Our guide to slab leak warning signs is worth reading if you are not yet sure that is what you have. If the damp is coming from a waste line rather than a supply line, sewer line repair is the relevant page.
Slab leak work covers San Antonio and communities including Schertz, where the clay is much the same. See the complete service area list or describe what you have noticed.
Slab Leak Questions
What affects the cost of slab leak repair?
Mostly the route chosen. Opening the slab at one spot, rerouting the line overhead and repiping the house are three different scopes of work, and the flooring above the leak matters as well. San Antonio 24 Hour Plumber prices the locating separately and then quotes each realistic option so you can compare them.
Can a slab leak be repaired without breaking the floor?
Often, yes. Rerouting abandons the failed section under the concrete and runs a new line through the attic and walls instead, which leaves the floor intact. It is not right for every layout, but it is the first option worth asking about if the leak sits under tile, wood or a kitchen island.
Is it safe to keep using the water?
A slow slab leak is not an immediate danger, but it is washing soil out from under the foundation the whole time it runs, so it should not be left for weeks. If the leak is on the hot side, switching the water heater off reduces the loss. If flooring is lifting or you can see water at the baseboards, shut the main off and call San Antonio 24 Hour Plumber.
Will a slab leak damage my foundation?
It can, given time. Water running under a slab erodes the soil supporting it and keeps one area of clay permanently swollen, which is exactly the uneven movement that cracks concrete and sticks doors. That is the reason a slab leak is treated as urgent even when nothing is visibly flooding.
Arrange slab leak repair in San Antonio
Tell us what you have noticed and we will plan the right visit.