Office hours Monday to Friday, 7 AM to 5 PM. Licensed plumbers on call 24/7 for plumbing emergencies. Call 979-473-9775

4L Contracting LLC

SLAB LEAK DETECTION IN COLLEGE STATION AND BRYAN

  • Five star ratedOn Google, by our customers
  • LicensedTexas Master Plumber 40980
  • On call 24/7Licensed plumbers for emergencies
  • Brazos ValleyCollege Station, Bryan and nearby

A slab leak is harder to see than a burst pipe, but the signs are there. Your water bill jumped and nothing changed in your habits. There is a warm spot on the floor you cannot explain. You hear the sound of running water when every fixture in the house is off.

Flooring has cracked or a carpet edge has gone damp. Your water meter creeps forward with everything closed. Any one of these is worth a call.

4L Contracting holds Texas Master Plumber License 40980. You can verify any Texas plumbing license at tsbpe.texas.gov. We have over 50 years of combined experience locating and repairing slab leaks across College Station, Bryan, Brenham and the surrounding Brazos Valley counties. Office hours Monday to Friday, 7 AM to 5 PM. Licensed plumbers on call 24/7 for plumbing emergencies.

Call 979-473-9775Request an Estimate

A concrete saw cut opened to reach a pipe under the slab

HOW WE LOCATE A LEAK WITHOUT TEARING UP YOUR HOUSE

Opening a slab to find a leak is not something you do on a guess. We use a sequence of non-invasive steps to confirm and locate the breach before any concrete is touched.

Pressure Testing

We isolate your plumbing lines and measure how pressure holds over time. If the reading drops with no fixtures open, there is a breach somewhere in the system. This step confirms a leak exists before we move to locating it. It also tells us which line is leaking, which matters when choosing a repair path.

  • Confirms leak presence before detection equipment is deployed
  • Isolates hot side from cold side
  • Guides which line to trace

Acoustic Detection

Water escaping under pressure creates sound as it moves through soil and into the slab. We use sensitive listening equipment on the floor surface to detect and map that sound. The loudest point gives us the leak location without opening any concrete first.

  • Non-invasive, no cutting or drilling required
  • Pinpoints location to a small area
  • Works on both hot and cold lines

Electronic Line Tracing

Sometimes we need to confirm the path of the line itself. We use electronic tracing equipment to follow the pipe through the slab from a known access point. Combined with acoustic data, this lets us mark the exact spot before any concrete is opened.

  • Maps pipe path when routing is unknown
  • Reduces the size of the concrete opening required
  • Confirms leak point before any work begins

Once detection is complete, we walk you through exactly where the leak is and what we found before recommending any repair. You understand the problem before we pick up a saw.

Not every hidden leak is under the slab. If pressure testing does not point to the foundation, the breach may be inside a wall, ceiling, or supply line elsewhere in the house. See how we handle leaks that are not under the slab.

YOUR REPAIR OPTIONS ONCE WE FIND IT

Finding the leak is only the first part. The repair path depends on how old your pipes are and how many leaks have happened before. It also depends on what makes the most sense for your home over the long run. Here are the three approaches we use. We can also tunnel in from outside to reach the line without opening your floor.

Spot Repair Through the Slab

Best for Single point failure, pipe in good condition elsewhere

We open a targeted section of concrete directly above the leak and make the repair. Then we pressure test to confirm it is holding. Closing the concrete back up is separate work. We do not do that part ourselves, and we can arrange it for you. This is the least invasive option when the leak is isolated and the rest of the line is in good shape.

  • Smaller opening, faster job
  • Flooring over the opening will need repair or replacement
  • Good choice when pipe material is sound

Rerouting Line Overhead or Through Walls

Best for Multiple leaks or corroded copper under slab

Instead of opening the slab at all, we abandon the problem line. A new line then runs through attic space, through interior walls, or along the exterior. The failed pipe stays in the slab. This works well when the pipe material itself is the problem rather than a single failure point.

  • No concrete work required
  • New line is fully accessible for future service
  • Requires carpentry for wall or ceiling pathways

Full Repipe

Best for Aging copper throughout the house, recurring leaks

If your slab leak is the second or third in a few years, the pipe material has reached the end of its life. Repiping the whole house replaces all the supply lines at once. It costs more upfront but eliminates future slab leak repairs. Over the life of the house it is often cheaper than spot-repairing a system that keeps failing.

  • Eliminates future slab leak risk from same cause
  • Price per foot is lower when done all at once
  • Good option when copper has active pitting or multiple weak points

We will recommend the option that makes sense for your situation and your budget. If full repipe is cheaper over time, we will tell you that. If a spot repair is the right call, we will tell you that too. You get a straight recommendation, not a push toward the most expensive job.

What our customers say

Published exactly as written, straight from Google.

  • Found late Friday evening that I did not have hot water, and it was the weekend... YIKES!! Contacted 4L Contracting LLC; they came out within a couple of hours and had me working in a short time. Lee went above and beyond, letting me know about other problems identified in my attic, a problem with my chimney, and a heating vent installation problem. After he left, I found a water leak in the laundry room ceiling. He turned around and came back to my house. He found the air conditioning drain pipe was backed up. He blew it out the drain pipe, preventing a big disaster. So appreciate his thoroughness and helping me on a Friday after-hours house call. He definitely went above and beyond.

    Laurie CunninghamGoogle Review
  • I had a great experience working with 4L Contracting LLC. They were awesome to work with, they were professional, responsive, and clearly knew what they were doing. We had a massive leak that needed immediate attention, and they showed up quickly and handled it efficiently. They not only fixed the issue fast but also made sure everything was done right. I would absolutely recommend them to anyone needing reliable, high quality work!

    Jada WoolleyGoogle Review
  • Used 4L Contracting the first time a couple years ago and since then they have replaced a water heater, reset toilets, replaced water lines, and located and fixed a leak under the house! They have been amazing to work with over the years, I cannot recommend these guys enough!

    Mary JohnsonGoogle Review
  • Water Softener installation Completed! Just wanted to give a shout out to Kurt and Lane on their outstanding customer service today. I hired 4L Contracting LLC to install a water softener in our home. After finding out the water softener I had purchased was missing parts, the job was rescheduled for Monday. I was able to return the water softener and get a replacement fairly quick. So I sent a text to Kurt, letting him know I had done so. He informed me they were nearby and could do the job in about 30 minutes if I could meet them back at my home. I hurried home and in about 2 hours the job was completed. Tonight my wife and I shall enjoy a soft water shower!

    Sam StathakosGoogle Review
  • My husband and I had a broken pipe in the foundation and it was leaking pretty bad into our hallway, and 4L Contracting came that day we called, assessed the issue, and was back the next day and completely fixed the problem. They were so nice and helpful! I cannot tell you how pleased we were with their service. I recommend 4L Contracting!

    Kim PagachGoogle Review
  • My wife and I discovered a water leak coming out of our wall. 4L Contracting LLC came out that day and found where the leak was coming from (copper pipe leaking in the slab), they started working immediately and finished the next day.

    Stephen PagachGoogle Review
  • These plumbers are honest, knowledgeable and reliable! They helped us fix a leak and answered all our questions about other issues in the house. Highly recommend!

    Kaitlin WeathersGoogle Review
  • Lee and his guys are Great. Their communication on our projects have been superb! Always letting us know when they will be at the job site. Lee is doing 3 projects for our Airbnb's at one time, and his organization of his paperwork is paramount for us.

    Michael WimberlyGoogle Review

Read all reviews on Google

WHAT WAITING COSTS YOU

We are not going to tell you your house will fall apart tomorrow. What we will do is explain plainly what happens when water continues to run under a slab over time.

Foundation Movement

A slab leak sends water into the soil beneath your foundation over days, weeks, or months depending on the leak size. Soil under a slab in central Texas expands when wet and contracts when dry. Uneven moisture from a slow leak creates uneven movement. That can show up as cracks in walls, doors that stick, or floors that are no longer level. The longer water runs under the slab, the more soil movement accumulates.

This is not a prediction of catastrophic failure. It is a straightforward explanation of what happens when water sits under a foundation long enough.

Mold and Damaged Flooring

Water coming up through or around a slab reaches the flooring above it. Tile can crack or pop. Wood and laminate swell. Carpet stays damp at the edges or along a wall. Damp conditions in an enclosed space create conditions where mold can grow in the subfloor, in baseboards, or behind trim. Mold remediation is a separate cost from the plumbing repair.

Catching the leak early limits the water exposure and keeps the secondary damage smaller.

Water Bills That Keep Climbing

A slab leak does not stop running between billing cycles. If your water bill jumped and has stayed elevated, the leak is still running. Every month you wait, you pay for water that is going straight into the soil. The detection and repair cost is fixed. The wasted water cost compounds every month you delay.

Many homeowners are surprised to learn how much water a small line can lose over a 30 day billing period.

If you have seen one of the warning signs listed at the top of this page, call us to schedule a pressure test. The test tells you within the same visit whether a leak is present and roughly where to look. Not sure whether your leak is under the slab or elsewhere in the house? Our leak detection service covers hidden leaks in walls, ceilings, floors, and supply lines as well.

WHAT IT COSTS AND HOW YOU PAY

Detection cost and repair cost depend on what the leak is and where it is. They also depend on which repair path makes the most sense for your house. We do not publish numbers that will not apply to your specific situation. We give you a firm written price once we know what we are dealing with.

Price in Writing Before Work Starts

After detection is complete, we provide a written quote covering the specific repair method recommended for your situation. No verbal estimates. No extra charges added after the fact. You approve the scope and cost before we open anything.

Financing Available

Slab leak repair, and especially a reroute or repipe, is a meaningful expense. We offer financing to qualified customers so the work does not have to wait. Ask about financing terms when you call.

Workmanship Warranty

Every repair we perform is backed by a workmanship warranty. If a problem with our work develops within the warranty period, we return and fix it at no charge to you.

Office Hours and Emergency Availability

Office hours Monday to Friday, 7 AM to 5 PM. Licensed plumbers on call 24/7 for plumbing emergencies. Reach us at 979-473-9775.

Texas Master Plumber License

Over 50 years of combined experience. 5 star rated service. Serving College Station, Bryan, Brenham and surrounding Brazos Valley counties.

Older galvanised water pipe and a shutoff on a wall

Not sure where to start?

Talk to a licensed plumber

Describe what your plumbing is doing and we will tell you what it likely is before anyone comes out.

SLAB LEAK DETECTION NEAR YOU

We find slab leaks across College Station, Bryan and the towns around them. Pick your town, or check whether we cover your area.

BryanCollege StationSurrounding areas

CALL FOR A PRESSURE TEST TODAY

If you have seen any of the signs listed on this page, call us. We will schedule a pressure test, and use acoustic and electronic locating equipment to find the leak. You get a written repair quote before any concrete is opened.

Office hours Monday to Friday, 7 AM to 5 PM. Licensed plumbers on call 24/7 for plumbing emergencies. Serving College Station, Bryan, Brenham and surrounding Brazos Valley counties. See also Slab leak detection in Bryan TX.

Call 979-473-9775Request an Estimate OnlineGet a starting price

Common questions

Is it more likely to be a hot line or a cold line, and does that matter?

Hot lines fail more often under a slab. They move more with temperature change, they run hot against concrete, and hot water is harder on copper over the years. That is why a warm spot on the floor is such a common first sign. It matters because the pressure test isolates the hot side from the cold side, so knowing which one is losing water narrows the search and changes the repair options. A hot side failure is also the case where rerouting overhead is most often the sensible answer.

What if the pressure test shows the supply lines are fine?

Then you do not have a pressurized slab leak, which is worth knowing before anyone cuts concrete. Water under a floor can also come from a broken drain line beneath the slab, and a drain is not pressurized, so it shows nothing on a pressure test and nothing at the meter. It can also come from an air conditioning condensate line, from irrigation, or from groundwater moving against the foundation. Each is found a different way, and we tell you which one we are chasing rather than opening the floor on a guess.

Will you have to move my furniture, and does my flooring get in the way?

Acoustic listening needs contact with the floor and a quiet house, so the area above the suspected line has to be clear. We ask you to move what you can and we move the rest. Tile and concrete carry sound well. Thick carpet with pad, floating wood over foam, and a busy household all make it harder. Switching off ice makers, irrigation and anything else that cycles on its own helps more than most people expect, because those noises look like water on the wrong end of the equipment.

Once you find it, how long is my water off?

Detection itself does not require a long shutdown, though the pressure test isolates the system for a period while we watch the gauge. The repair is the part that matters to your day. A spot repair through the slab usually means water off for a few hours while the pipe is opened, repaired and tested. A reroute takes longer overall but the water is only off while the new line is tied in. You get the window before work starts so you can plan around it.

Who patches the concrete and who fixes the flooring?

We open the concrete and we make the repair. We do not patch it back ourselves. We can arrange that for you, so you are not left finding somebody. Finished flooring is a different trade again. Tile that had to be cut out has to be replaced, and matching an older tile run is often the hardest part of the whole job. That is why we ask whether you have spare tile stored anywhere before we cut. Both boundaries are stated in the written scope so nobody is surprised.

Does homeowners insurance pay for this?

It depends entirely on your policy and we will not tell you what yours says. What is common in Texas is that a policy may cover the access, meaning tearing out and putting back the slab and flooring, and the resulting water damage, while excluding the failed pipe itself. Call your carrier before work begins, get a claim number, and tell us you have one. We can supply the written scope, what the detection actually found and photographs for the file.

Can I stop this happening again after the repair?

Partly. If the leak was a single point failure, a spot repair is usually the end of it. If the pipe material itself is the problem, another leak is a matter of time, which is why we raise rerouting or repiping when the evidence points that way rather than after the third call. Two things you can control are water pressure and water quality. Pressure above the normal working range accelerates every weak point in the system, and a failed pressure regulator is quick to find.

We are selling the house. Does the leak have to be repaired first?

We are not attorneys and we will not advise you on disclosure. Here is the practical side. A buyer's inspector runs the same basic checks we do, and a meter that creeps with everything shut off is easy for anyone to find. An unexplained damp spot, or a repair with no paperwork behind it, tends to cost more at the negotiating table than the repair itself would have. We provide a written scope, the detection findings and an invoice describing what was done, which is what a buyer's agent will ask to see.

Have a plumbing question? Contact an expert.