Slab Leak Detection & Repair in San Antonio, TX
A warm spot on the floor, a huge water bill or the sound of running water, and you are afraid of tearing up your home. Call (210) 898-9754 or text us.
A slab leak is a leak in a pipe under or inside the concrete foundation. Stark Plumbing Solutions locates it electronically, explains your options (rerouting, tunneling or breaking the slab) and why we recommend one, and gives you the price in writing before any work starts.
Does this sound like a slab leak?
Signs of a Slab Leak
- Unexplained spike in the water bill, or a meter that moves when everything is off.
- Warm or wet spots on concrete or finished floors.
- Musty odors, mold or damp carpet near walls.
- Low water pressure or the faint sound of running water when faucets are closed.
- New cracks in walls or floors near the leak.
Confirm it with the meter test first. See Water Leak Detection.
Why Water Pipes Leak Beneath Concrete
Pipes under a slab are exposed to constant pressure, movement and chemistry.
- Shifting clay soil flexes the slab and stresses pipe and joints.
- Corrosion from aggressive water or aging copper.
- Abrasion where pipe rubs against concrete or gravel.
- Poor installation or fittings that fail with age.
- High water pressure that accelerates wear.
Not sure which of these matches your problem? Describe it and we will point you to the right fix.
☎ Call (210) 898-9754Slab Leak Diagnosis
We confirm the leak with pressure and isolation tests, then locate it with electronic leak detection. The aim is to find the leak within a small area, so any repair is targeted.
Specialists in San Antonio use pressure testing, isolation and electronic tools, and so do we. We tell you whether the leak is on a pressurized water line or on a gravity sewer drain, since the repair options are different. For sewer drains, see Sewer Line Repair.
Direct Pipe Repair vs. Rerouting
There are three common ways to fix a slab leak, and each has trade-offs. We explain which one fits your home and why.
| Option | How it works | Pros | Trade-offs |
|---|---|---|---|
| Rerouting | Abandon the leaking line and run a new one through the attic or walls | Often the fastest and cleanest for water supply lines | Does not work for gravity-flow sewer drains; new pipe is visible in walls or attic |
| Under-slab tunneling | Dig a tunnel from outside under the foundation to the pipe | Avoids breaking indoor flooring | More labor and cost; outdoor excavation |
| Breaking the slab | Cut through the concrete to reach the pipe | Direct access to the leak | Flooring and surface restoration needed |
On forums, homeowners ask about foundation problems after a trenched repair. It is a fair question, and we discuss it before work, not after.
Repairing Hot and Cold Water Slab Leaks
Hot water lines tend to fail first because heat accelerates corrosion and expansion. A hot leak shows up as a warm spot and a high gas or electric bill as the heater runs constantly. Cold leaks are quieter and may show only as a high water bill and damp soil or flooring.
Where a line is old and has leaked more than once, repiping part or all of the system may cost less over time than repeated slab repairs. See Whole-House Repiping.
Protecting Flooring and Foundations
A slab leak left alone can soften soil under the foundation, damage flooring and feed mold. The sooner it is found, the smaller the repair. We protect finished floors and furniture during access, and explain restoration before we start.
If you see widening cracks, doors that stick or floors that slope, you may want a structural opinion as well as a plumber. We tell you what we see and where our work ends.
What Does Slab Leak Repair Cost in San Antonio?
Slab leak cost depends mostly on method and access. A reroute is often cheaper than tunneling or breaking concrete, and an under-slab sewer drain with tunneling is usually a bigger job than a water supply reroute. Homeowners in local forums report quotes ranging widely, with large bills where tunneling is involved. We give you the options and the price in writing.
What moves the price
- Hot or cold line, supply or sewer.
- Depth, location and how many leaks there are.
- Method: reroute, tunnel or break the slab.
- Flooring restoration, permits and access.
- Whether a larger repipe makes more sense.
How to avoid overpaying
- Ask for the leak location in writing and ask whether the quote covers floor or surface restoration.
- Ask for the price in writing before work starts, with labor, parts and any trip or diagnostic fee listed separately.
- Ask the plumber to explain the cause in plain words. If you get a vague answer, get a second opinion.
- Compare what is included, not just the headline price. A cheap special that grows into a long add-on list is not cheap.
- Never let scope change on the fly. If something new is found, work should stop until you approve it.
- Ask what happens if the problem comes back, and make sure anything promised is on the estimate.
What Happens When You Call Stark
- Call or textTell us what you see or hear. A photo helps. We will tell you what we think is going on and what the next step is.
- Diagnose firstWe confirm the leak, locate it electronically and lay out the options with the trade-offs before you decide.
- Written estimate, your approvalYou get labor, parts and any trip or diagnostic fee in writing. We wait for your go-ahead, and we stop and talk to you first if the scope changes.
- Fix, test, clean upWe complete the work, test it, and explain what we did and what to watch for.
What to do right now if you suspect a slab leak
- Turn off all water and check the meter for movement.
- If the meter keeps moving, shut off the main water valve to stop the damage.
- Note warm spots, damp areas and sounds, and take photos.
- Move rugs and furniture off any warm or damp flooring.
- Call us. Do not break concrete yourself.
Why San Antonio Homeowners Can Trust the Process
Most people tell us the hard part is not the repair. It is knowing whether the price is fair. Here is how we handle it, and you can hold any plumber to the same standard.
Labor, parts and any trip or diagnostic fee are listed before work starts.
We wait for your go-ahead. If scope changes, we stop and talk to you.
We tell you what we found and what your options are, without pressure.
Look up any Texas plumber at tsbpe.texas.gov and ask for proof of insurance.
1011 Ada St, San Antonio, TX 78223. A real shop you can find.
Related Plumbing Services
- Water Leak DetectionFind hidden leaks without tearing into walls.View service →
- Whole-House RepipingFailing pipes replaced to restore pressure and water quality.View service →
- Plumbing RepairLeaks, valves, worn pipes and fixtures diagnosed and fixed.View service →
- Water Line Repair & ReplacementLeaking or corroded lines between the meter and your home.View service →
- Sewer Line RepairBackups, smells and gurgling traced to damaged sewer pipe.View service →
- Emergency PlumberFast help for active leaks, backups and no-water emergencies.View service →
Slab Leak Repair Near You
We serve homes and businesses across San Antonio and nearby neighborhoods. Pick your area for local details.
San Antonio · Stone Oak · Alamo Ranch · Medical Center · Southtown · All Service Areas →
Stark Plumbing Solutions
1011 Ada St, San Antonio, TX 78223
(210) 898-9754
Slab Leak Repair FAQs
How do I know if a pipe is leaking under my foundation?
Signs include an unexplained high water bill, a meter that moves with everything off, warm or wet floor spots, the sound of running water, low pressure, and musty smells or mold near walls. A leak detection visit confirms it and locates the leak.
Can a slab leak be repaired without major demolition?
Often yes. Rerouting a water supply line through the attic or walls can avoid breaking the slab, and tunneling from outside can reach the pipe without tearing up indoor floors. The right option depends on your home and the type of line.
What causes slab leaks?
Shifting clay soil, corrosion, abrasion against concrete or gravel, aging pipe and fittings, high water pressure and installation problems. Hot water lines often fail first.
Will a slab leak damage my foundation?
A long-running leak can soften soil under the slab and contribute to movement, flooring damage and mold. Fixing it early limits the damage. If you see widening cracks or sloping floors, consider a structural opinion.
Will insurance pay for a slab leak?
It depends on your policy and the cause. Some policies cover resulting damage but not the pipe, and wear and tear is often excluded. Check with your insurer and keep written findings and receipts.
Will I know the price before work starts?
Yes. You get a written estimate listing labor, parts and any trip or diagnostic fee, and we wait for your approval. If we find something that changes the scope, we stop and talk to you first.
Ready When You Are
Call or text with a short description and a photo if you can. We will tell you what we think is going on, what it involves and what the next step is.