Slab Leak Detection & Repair in Austin, TX

What a Slab Leak Actually Is

Most Austin homes built after the 1960s sit on a poured concrete slab, with copper or PEX supply lines and cast-iron or PVC drain lines running inside or beneath that concrete. A slab leak is a break in one of those buried pipes. Because the water has nowhere obvious to go, it saturates the sub-grade soil, wicks up through the concrete, and surfaces days or weeks later as warped flooring, a musty smell, or an unexplained spike in your water bill.

Two things make this worse in Central Texas than almost anywhere else. First, our soil. Second, our water pressure. Together they turn a hairline pinhole into a foundation problem.

Why Austin's Soil Breaks Pipes

Much of the metro east of MoPac sits on Blackland Prairie clay, a montmorillonite soil that swells when wet and shrinks when dry. Between an August drought and a September downpour, that ground can move enough to shear a rigid copper line encased in concrete. Neighbourhoods in East Austin, Pflugerville, Round Rock and Manor see this repeatedly. West of the Balcones Fault the problem inverts: thin soil over Edwards limestone means less movement, but far more abrasive rock contact against the pipe wall.

Older homes carry extra risk. Pre-1970 construction in Hyde Park, Travis Heights, Clarksville and Rosedale often still has original copper or galvanized supply lines that have been quietly corroding for fifty years.

Signs You Have a Slab Leak Right Now

• A warm spot on the floor. The single most reliable indicator. If one patch of tile or hardwood is noticeably warmer than the floor around it, you almost certainly have a break in a hot-water line below.
• The water meter moves with everything off. Shut every tap, appliance and ice maker. Then watch the small triangular or gear-shaped low-flow indicator on your Austin Water meter. If it creeps, water is escaping somewhere between the meter and your fixtures.
• Water bill climbs with no change in habits. A 1/8-inch under-slab break can waste thousands of gallons a month.
• Sound of running water in a quiet house. Usually a faint hiss or trickle that seems to come from the floor.
• Cracked or lifting flooring. Tile grout failing in a line, laminate swelling at the seams, or hardwood cupping in a corridor.
• Musty odour with no visible source. Moisture rising through the slab feeds mould inside wall cavities and under cabinets.
• New foundation cracks or doors that stick. Saturated soil loses bearing capacity, letting one part of the slab settle.

If you are seeing several of these together, treat it as urgent. Call (512) 991-0679.

How We Locate the Leak Without Breaking Your Floor

Guesswork means jackhammering. We invest the time up front to pinpoint the break so that any concrete we open is measured in inches rather than feet.

1. Pressure Isolation Testing

We isolate the hot and cold supply loops and the drain system separately and put each under test pressure. Watching which circuit loses pressure, and how fast, tells us whether we are chasing a supply-side pinhole or a drain-side break, and roughly how large it is.

2. Infrared Thermal Imaging

A hot-water leak heats the concrete above it. A calibrated thermal camera renders that plume as a clear gradient across the floor, which usually narrows the search to a few square feet.

3. Acoustic Leak Correlation

Water escaping a pressurised pipe makes a distinctive high-frequency noise. Ground microphones and correlating amplifiers let our technicians hear that signature through concrete and triangulate on it, even under tile or engineered wood.

4. Tracer Gas Where Needed

For non-pressurised drain lines or leaks too quiet to hear, we introduce a safe helium/nitrogen tracer into the line. The gas migrates up through the slab, and a surface probe detects exactly where it emerges.

5. Line and Depth Marking

Before anything is opened, we mark the pipe route and depth on the floor and give you photographs of the findings, which also becomes part of your insurance documentation.

Repair Options Once We Find It

There is rarely only one way to fix a slab leak. The right choice depends on pipe age, how many previous leaks you have had, and how accessible the break is.

• Spot repair. Open a small section of slab, cut out the failed length, and replace it. Fastest and cheapest when the rest of the plumbing is sound and this is a first failure.
• Reroute above slab. Abandon the buried run and route a new line through walls and attic instead. Costs more up front but removes that section from the soil-movement problem permanently. Often the better economic call on a home that has already had two or more leaks.
• Full repipe. Where original copper or galvanized pipe is failing in several places, replacing the whole distribution system usually costs less than a rolling series of individual repairs.
• Pipe lining. For accessible drain lines, an epoxy liner can rehabilitate the pipe without opening the slab at all.

We are candid about which of these actually makes sense for your house, including when the cheapest option is the right one.

Drying the Damage the Leak Already Caused

Fixing the pipe stops the water. It does not dry the house. This is the step homeowners most often skip, and it is where mould claims come from.

Concrete holds moisture stubbornly, and a slab that has been wet for weeks will keep feeding humidity into flooring and baseboards long after the plumbing is sound. Our crews follow the IICRC S500 standard: moisture-map the affected area, set LGR dehumidifiers and air movers sized to the actual cubic footage, use specialised drying systems to pull moisture from wall cavities and beneath flooring, and take daily readings until materials reach dry standard. Where hardwood is involved, floor mat drying can often save planks that would otherwise be replaced.

If the leak went undetected long enough for growth to start, we handle mould remediation under containment as part of the same project.

Insurance and Slab Leaks in Texas

This is where Texas homeowners get caught out. A standard policy covers sudden and accidental discharge. It typically pays to tear out and replace the flooring and to dry the structure, and it often pays for the access work needed to reach the pipe. What it usually does not cover is the pipe itself, and it will frequently deny a claim where damage resulted from continuous or repeated seepage over an extended period.

Practically, that means the clock matters. Documentation created at the moment of discovery is what supports a "sudden" characterisation. We provide dated thermal images, moisture maps and daily dry-logs, and bill carriers directly. Our Texas water damage insurance guide covers the exclusions in more detail.

One local item worth knowing: Austin Water operates a leak-adjustment programme that can credit part of an abnormally high bill caused by a qualifying hidden leak, provided you repair it and submit the paperwork. Ask us for the repair documentation you will need.

Where We Work

We detect and repair slab leaks across the metro, including South Austin, East Austin, North Austin, Northwest Austin, West Austin, Downtown Austin, Round Rock, Pflugerville, Cedar Park, Georgetown and Lakeway.