--- title: How Do I Know If I Have a Slab Leak? description: A slab leak hides beneath your foundation & causes serious damage fast. Learn the signs, causes, & repair options from a Lafayette plumber you can trust. image: https://www.acadianarooter.com/hubfs/Blog%20Feature%20Images/What%20Is%20a%20Slab%20Leak%20and%20How%20Do%20You%20Know%20If%20You%20Have%20One%20(1).png --- [Skip to the main content.](https://www.acadianarooter.com/blog/what-is-a-slab-leak-and-how-do-you-know-if-you-have-one#main-content) [![White Logo - Acadiana Rooter (1)](https://www.acadianarooter.com/hs-fs/hubfs/White%20Logo%20-%20Acadiana%20Rooter%20(1).png?width=1563&height=518&name=White%20Logo%20-%20Acadiana%20Rooter%20(1).png "White Logo - Acadiana Rooter (1)")](https://acadianarooter.com) [![Acadiana-Rooter-Logo-Color-1](https://www.acadianarooter.com/hs-fs/hubfs/Acadiana-Rooter-Logo-Color-1.png?width=2577&height=794&name=Acadiana-Rooter-Logo-Color-1.png "Acadiana-Rooter-Logo-Color-1")](https://acadianarooter.com) - [About](https://www.acadianarooter.com#about) - [Services](https://www.acadianarooter.com/services) - [General Plumbing](https://www.acadianarooter.com/services#general-plumbing) - [Tankless Water Heaters](https://www.acadianarooter.com/services#tankless-water-heaters) - [Backflow Preventer](https://www.acadianarooter.com/services#backflow-preventer) - [Sewage](https://www.acadianarooter.com/services#sewage-services-and-cleaning) - [Drain Cleaning](https://www.acadianarooter.com/services#drain-cleaning) - [Pipe Lining & Repair](https://www.acadianarooter.com/nuflow-pipe-lining) - [Blog](https://www.acadianarooter.com/blog) - [Get a Free Estimate](https://www.acadianarooter.com/contact) - [Call Ben Today!](tel:7969252049) Search *Search* Toggle Menu Search *Search* Toggle Menu - [About](https://www.acadianarooter.com#about) - [Services *Toggle Menu*](https://www.acadianarooter.com/services) - [General Plumbing](https://www.acadianarooter.com/services#general-plumbing) - [Tankless Water Heaters](https://www.acadianarooter.com/services#tankless-water-heaters) - [Backflow Preventer](https://www.acadianarooter.com/services#backflow-preventer) - [Sewage](https://www.acadianarooter.com/services#sewage-services-and-cleaning) - [Drain Cleaning](https://www.acadianarooter.com/services#drain-cleaning) - [Pipe Lining & Repair](https://www.acadianarooter.com/nuflow-pipe-lining) - [Blog](https://www.acadianarooter.com/blog) - [Get a Free Estimate](https://www.acadianarooter.com/contact) - [Call Ben Today!](tel:7969252049) [*Facebook*](https://www.facebook.com/Acadiana-Rooter-105526979068992/) [*Instagram*](https://www.instagram.com/acadianarooter/) [*LinkedIn*](https://www.linkedin.com/company/acadiana-rooter/) 7 min read # What Is a Slab Leak and How Do You Know If You Have One? [The Flow Patrol](https://www.acadianarooter.com/blog/author/the-flow-patrol) : Updated on September 23, 2026 [Louisiana Plumbing](https://www.acadianarooter.com/blog/tag/louisiana-plumbing) [NuFlow Pipe Lining](https://www.acadianarooter.com/blog/tag/nuflow-pipe-lining) [Plumbing Maintenance](https://www.acadianarooter.com/blog/tag/plumbing-maintenance) [Leak Detection](https://www.acadianarooter.com/blog/tag/leak-detection) [Pipelining & Repair](https://www.acadianarooter.com/blog/tag/pipelining-repair) **Table of Contents** [What Causes a Slab Leak?](https://www.acadianarooter.com/blog/what-is-a-slab-leak-and-how-do-you-know-if-you-have-one#what-causes-a-slab-leak) [What Are The Warning Signs of a Slab Leak?](https://www.acadianarooter.com/blog/what-is-a-slab-leak-and-how-do-you-know-if-you-have-one#warning-signs-of-slab-leaks) [Can You Confirm a Slab Leak Yourself?](https://www.acadianarooter.com/blog/what-is-a-slab-leak-and-how-do-you-know-if-you-have-one#confirm-a-slab-leak-yourself) [How is a Slab Leak Repaired?](https://www.acadianarooter.com/blog/what-is-a-slab-leak-and-how-do-you-know-if-you-have-one#how-to-repair-a-slab-leak) [Spot Repair](https://www.acadianarooter.com/blog/what-is-a-slab-leak-and-how-do-you-know-if-you-have-one#spot-repair) [Pipe Re-route](https://www.acadianarooter.com/blog/what-is-a-slab-leak-and-how-do-you-know-if-you-have-one#pipe-reroute) [Nuflow Pipe Lining](https://www.acadianarooter.com/blog/what-is-a-slab-leak-and-how-do-you-know-if-you-have-one#nuflow-pipe-lining) [What Should You Do if You Think You Have a Slab Leak?](https://www.acadianarooter.com/blog/what-is-a-slab-leak-and-how-do-you-know-if-you-have-one#what-should-you-do-if-you-have-a-slab-leak) [FAQs](https://www.acadianarooter.com/blog/what-is-a-slab-leak-and-how-do-you-know-if-you-have-one#FAQ) | A slab leak is a leak in the water supply or sewer lines that run beneath your home's concrete foundation. Because these pipes are buried under several inches of concrete, they can leak for weeks or months before any visible damage appears above ground; quietly driving up your water bill and eroding the soil and structure beneath your home the entire time. | | --- | For homeowners in Lafayette, Broussard, and across Acadiana, slab leaks are more common than most people realize. Older pipe materials, Louisiana's shifting clay soil, and our humid climate create the exact conditions that cause underground pipes to corrode and fail,  often with very little warning. In this post, we'll cover what causes a slab leak, the warning signs to watch for in your home, how professionals find and fix them, and what it typically costs to repair one in the Lafayette area. [![Contact Us (6)](https://no-cache.hubspot.com/cta/default/23516633/interactive-209542304864.png)](https://www.acadianarooter.com/hs/cta/wi/redirect?encryptedPayload=AVxigLI3mE5eSanScuM8T2yVU1RWphm%2FMae4rb4CaJ%2B2E4Rc2KK1CIfOUPOeNiFEa8Rql6Kwmy2dSuua%2Fgy1jLXojJLaCJ4bT7gB8kBA87fyMCO7FSydoAPYLvGzWTorvddglHRf9QZekfMTdvgnPKOceJDZ098tHJ0Mdedh28X6QjAiX145GZQbEHqn&webInteractiveContentId=209542304864&portalId=23516633) ## What Causes a Slab Leak? Slab leaks are most often caused by a combination of aging pipes, soil movement, and corrosion, and Acadiana homes tend to check all three boxes. [Tree roots](https://www.acadianarooter.com/blog/are-tree-roots-damaging-your-sewer-line)are another overlooked culprit - roots naturally seek out moisture and can infiltrate [drain line](https://www.acadianarooter.com/blog/drain-cleaning-lafayette-la-what-never-to-flush-or-pour-down) joints beneath the slab, cracking pipes and causing slow leaks that are difficult to detect from above. **Here's what's actually happening beneath your foundation:** - Pipe age and material Many homes built in the 1960s through the 1980s in the Lafayette area were plumbed with galvanized steel or cast iron pipes. Both materials have a lifespan of roughly 50 to 70 years, which means a significant portion of older Acadiana homes are living on borrowed time underground. These pipes weren't designed to last forever; they were designed for a generation that has long passed. - Louisiana's soil movement The clay-heavy soil common throughout South Louisiana expands when it absorbs water and contracts when it dries out. This seasonal shifting puts constant lateral and vertical pressure on buried pipes. Over decades, that movement bends, cracks, and separates joints in ways that no pipe material can fully resist. - Corrosion from both sides Pipes beneath a slab face a double threat: the high humidity above ground accelerates oxidation from the outside, while the chemistry of Louisiana's soil (often acidic and mineral-rich) eats at the pipe from below. Rusted pipes beneath a slab rarely fail all at once. They seep slowly, silently, and expensively. - Abrasion and water pressure Where pipes make contact with rough concrete, decades of slight movement cause gradual abrasion at the pipe wall. Consistently high water pressure compounds this by stressing joints and fittings faster than normal. Both are slow burns, the kind that don't announce themselves until the damage is already done.   ## What Are The Warning Signs of a Slab Leak? The most common signs of a slab leak are warm spots on the floor, the sound of running water with everything shut off, an unexplained rise in your water bill, and cracks appearing in flooring or baseboards. Most homeowners don't connect these dots until the signs stack up, which is why knowing what to look for matters. **Signs to watch for in your home:** - **Warm or hot spots on the floor** — especially on tile, hardwood, or concrete with no visible heat source nearby. This is one of the most reliable indicators of a hot water line leak beneath the slab. - **The sound of running water when everything is off** — most noticeable at night in a quiet house. If you can hear water moving but nothing is running, take it seriously. - **A [water bill](https://www.acadianarooter.com/blog/why-does-my-water-bill-keep-going-up) that keeps climbing** — without any change in your household's habits. If you've already ruled out a running toilet or dripping faucets and the bill is still rising, the leak may be underground. - **Cracks in flooring, baseboards, or drywall** — caused by moisture swelling the materials from below. These often appear near the floor and get dismissed as normal settling. - **A musty smell or mold at floor level** — water seeping up through or around the slab creates ideal conditions for mold growth, often before any visible moisture appears. - **A [sudden drop in water pressure](https://www.acadianarooter.com/blog/what-causes-low-water-pressure-in-a-home) throughout the house** — if pressure dropped noticeably and nothing else changed, a pressurized supply line leak beneath the slab may be the cause. - **Damp carpet or unexplained wet spots** — particularly along walls or in the center of rooms with no spill to explain them. None of these signs is definitive on its own, but two or more together, especially if they appeared gradually over the same period, are a strong indicator that something is happening below your foundation. ## Can You Confirm a Slab Leak Yourself? There is one diagnostic a homeowner can run themselves that takes about 20 minutes and gives you a clear yes or no on whether you have an active leak somewhere on the property: 1. **Turn off every water source in the house - dishwasher, ice maker, washing machine, all faucets.** 2. **Find your water meter, usually at the curb in a small covered box near the street.** 3. **Note the exact reading, or watch the small triangle or dial indicator on the face of the meter.** 4. **Wait 20 minutes without using any water.** 5. **Check the meter again. If the reading changed or the dial moved, you have an active leak.** That test tells you a leak exists. What it cannot tell you is where the leak is, whether it's above or below the slab, how serious it is, or what it will take to fix it. That's where the diagnostic ends for a homeowner and where a professional takes over. Locating a slab leak requires specialist equipment and trained experience. Acadiana Rooter uses acoustic leak detection,  sensors that listen for the distinctive sound signature of pressurized water escaping through a pipe buried in concrete. Combined with electronic amplification, pressure testing, and thermal imaging cameras that detect temperature changes at the slab surface, a trained plumber can pinpoint the source without tearing up your floor on a guess. ## How is a Slab Leak Repaired? A slab leak can be fixed in one of three ways:  a targeted spot repair, a pipe re-route, or trenchless pipe lining,  and which approach is right depends on the location of the leak, the age of your pipes, and what material they're made from. ### Spot Repair If the pipe is otherwise in good condition and the leak is isolated, a targeted jackhammer access point is cut into the slab above the leak, the damaged section is repaired or replaced, and the concrete is patched. It's the most straightforward option when the rest of the pipe system is sound. ### Pipe Re-route If the damaged section is in a difficult location — under a load-bearing wall, beneath tile that can't be disturbed, or in a spot that makes access cost-prohibitive — the pipe can be rerouted through the walls or attic, bypassing the slab entirely. This avoids excavation and is often the right call for specific sections of older systems. ### [NuFlow Pipe Lining](https://www.acadianarooter.com/nuflow-pipe-lining) For homes with aging pipe systems throughout the slab, trenchless pipe lining is often the most cost-effective long-term solution. Rather than digging up and replacing individual sections, a flexible epoxy-coated liner is inserted into the existing pipe and cured in place, forming a seamless new pipe inside the old one, without excavation. If your pipes are corroding in one spot, they're likely corroding elsewhere too. Lining the system addresses the root problem rather than waiting for the next failure. [View our pipelining solutions](https://www.acadianarooter.com/nuflow-pipe-lining)   ## What Should You Do if You Think You Have a Slab Leak? If something in your home has been feeling off,  floors that are warmer than they should be, a water bill that won't stop climbing, a sound you can't place, trust that instinct and get it looked at. Slab leaks don't resolve on their own. Every day they run, they do more damage to the structure of your home and more damage to your wallet. For homes built before 1990 in the Acadiana area, a [routine plumbing inspection](https://www.acadianarooter.com/blog/routine-plumbing-inspections-save-you-money) every couple of years is one of the most cost-effective ways to catch early signs of pipe corrosion or pressure loss before a slab leak develops.  The good news is that a proper inspection gives you answers fast. You don't have to live with the uncertainty. ### **[Why homeowners across Acadiana call us first](https://www.acadianarooter.com/blog/choosing-a-lafayette-la-plumber-licensed-local-trusted):** - Licensed Master Plumber with over 28 years of experience diagnosing and repairing plumbing systems across South Louisiana - NuFlow-certified pipe lining specialist, one of the only certified trenchless repair technicians in the Acadiana area - Veteran-owned and operated, built on the same standards of discipline and precision Ben brought home from 15 years of military service - We use professional acoustic leak detection, thermal imaging, and pressure testing — not guesswork- to locate slab leaks without unnecessary destruction to your home - [Local to Acadiana](https://www.acadianarooter.com/blog/broussard-independence-festival-sponsor), which means we know exactly what Louisiana's soil, climate, and aging pipe systems do to homes like yours At Acadiana Rooter Plumbing, we'd rather find a small leak today than help you deal with the fallout from a big one later. When you call us, you're talking to someone who has seen it all and fixes it right the first time. [![Contact Us CTA 2 (1)](https://no-cache.hubspot.com/cta/default/23516633/interactive-199064492878.png)](https://www.acadianarooter.com/hs/cta/wi/redirect?encryptedPayload=AVxigLKjOk0KbQfzNvlxSD7BXlLJspEInxNu0hyOFDe8Sax0fuv04UcAqUVSfT3ppWcSSSV6CE11Cy%2FvnEK6gp2Vfoz7zG8dCvEBXXIHYR%2F3GE0YfvFZgxZslYG18vJzYqUmdUtz9wx4caoC4qlWo%2BzH7hHk08p9zz%2F7Jke06%2BUYmfxr7g%2FESdKZCTU%3D&webInteractiveContentId=199064492878&portalId=23516633) ### Frequently Asked Questions - #### Can a slab leak cause foundation damage to my home? Yes, and this is one of the biggest reasons a slab leak shouldn't be left alone. Water escaping beneath the slab erodes the soil that supports your foundation. Over time, that loss of support causes the concrete to settle unevenly, which leads to cracking, shifting, and in serious cases, structural instability. Louisiana's clay-heavy soil is particularly susceptible to this kind of erosion because it softens and displaces quickly when saturated. A slab leak caught early is a plumbing repair. One caught late can become a foundation repair on top of it. - #### Can I stay in my house during slab leak repair? In most cases, yes! Though it depends on the repair method. A spot repair may require water to be shut off for a portion of the day while the work is completed, but the house remains livable throughout. A pipe re-route is similarly low-disruption. If the scope of the job requires an extended water shutoff or significant access through flooring, we'll let you know in advance so you can plan accordingly. We aim to cause as little disruption to your daily routine as possible. - #### Will a slab leak show up on a home inspection? Not reliably. Standard home inspections are visual — the inspector checks what they can see and test at the surface. A slab leak buried beneath concrete won't be visible, and a brief faucet-pressure check won't necessarily reveal a slow underground loss. If you're buying a home in Acadiana that was built before 1990, it's worth asking for a dedicated plumbing inspection that includes a water meter test and, if warranted, a camera or pressure evaluation of the underground lines. Discovering a slab leak after closing is significantly more stressful than knowing about it before. - #### Is a slab leak covered by homeowners insurance? It depends on your specific policy and the cause of the leak. Many homeowners insurance policies cover the resulting water damage — damaged flooring, drywall, or personal property — but not the pipe repair itself. Some policies exclude damage caused by gradual or long-running leaks entirely. We recommend reviewing your policy with your insurance provider before repairs begin, and documenting all visible damage with photos first. That documentation can make a meaningful difference when filing a claim. - #### How long does slab leak repair take? A straightforward spot repair can typically be completed in one day once the leak is located. A pipe re-route or NuFlow trenchless lining project may take one to three days depending on the scope of the system involved. The detection process itself — using acoustic sensors and pressure testing — is usually completed within a few hours. We'll give you a clear timeline before any work begins so there are no surprises. --- ![Acadiana-Rooter-Logo-Color-1](https://www.acadianarooter.com/hs-fs/hubfs/Acadiana-Rooter-Logo-Color-1.png?width=243&height=75&name=Acadiana-Rooter-Logo-Color-1.png)At Acadiana Rooter Plumbing, we take pride in providing reliable, honest, and professional plumbing services across Lafayette, Broussard, Youngsville, and the surrounding Acadiana area. From [drain cleaning and pipe repair to water heater installation and backflow testing](https://www.acadianarooter.com/services), our licensed plumbers handle every job with precision and care. As a veteran-owned company, we’re committed to serving our community with integrity and craftsmanship you can trust.   - [Tweet](https://twitter.com/share) [![How to Choose a Plumber in Lafayette, LA: Local Know-How and Red Flags](https://www.acadianarooter.com/hubfs/2026%20Images/Banner%20Images/Acadiana%20Rooter%20Plumbing%20Service%20Truck..png)](https://www.acadianarooter.com/blog/choosing-a-lafayette-la-plumber-licensed-local-trusted) #### [How to Choose a Plumber in Lafayette, LA: Local Know-How and Red Flags](https://www.acadianarooter.com/blog/choosing-a-lafayette-la-plumber-licensed-local-trusted) [The Flow Patrol](https://www.acadianarooter.com/blog/author/the-flow-patrol): Sep 23, 2026, 11:42:52 AM Most people pick a plumber in a hurry, usually while something is leaking. The checks below take about five minutes and they're the difference... 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In Acadiana, galvanized steel and cast iron pipes from the 1960s–80s are past their lifespan, Louisiana's clay-heavy soil shifts seasonally and puts pressure on buried pipes, and high humidity accelerates corrosion from both above and below ground." }, "name" : "What causes a slab leak?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "The most common signs of a slab leak are warm or hot spots on the floor, the sound of running water when everything is shut off, an unexplained rise in your water bill, cracks in flooring or baseboards, a musty smell at floor level, a sudden drop in water pressure, and damp carpet or unexplained wet spots. Two or more of these signs appearing together is a strong indicator of a slab leak." }, "name" : "What are the warning signs of a slab leak?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "You can run a water meter test to confirm whether an active leak exists: turn off all water in the house, note your meter reading, wait 20 minutes without using any water, and check the meter again. If the reading changed or the dial moved, you have an active leak. However, this test cannot tell you where the leak is or how serious it is — locating a slab leak requires professional acoustic detection equipment." }, "name" : "Can you confirm a slab leak yourself?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "A slab leak can be fixed one of three ways: a spot repair, where a targeted access point is cut into the slab above the leak and the damaged section is replaced; a pipe re-route, where the damaged line is bypassed through walls or the attic; or NuFlow trenchless pipe lining, where a flexible epoxy liner is inserted and cured inside the existing pipe without excavation. The right method depends on the leak location, pipe age, and material." }, "name" : "How is a slab leak repaired?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "If you notice warning signs — warm floors, a rising water bill, or the sound of running water with everything off — call a licensed plumber for a professional inspection as soon as possible. Slab leaks do not resolve on their own, and the longer they run, the more damage they cause to your foundation, flooring, and walls. Acadiana Rooter Plumbing provides slab leak detection and repair across Lafayette, Broussard, and Youngsville. Call (337) 858-5221." }, "name" : "What should you do if you think you have a slab leak?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Yes. Water escaping beneath the slab erodes the soil supporting your foundation, causing it to settle unevenly and crack over time. Louisiana's clay-heavy soil is especially vulnerable because it softens and displaces quickly when saturated. A slab leak caught early is a plumbing repair — one caught late can become a foundation repair on top of it." }, "name" : "Can a slab leak cause foundation damage to my home?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "In most cases, yes. A spot repair may require water to be shut off for part of the day, but the house remains livable throughout. A pipe re-route is similarly low-disruption. If extended water shutoff or significant floor access is required, your plumber should let you know in advance so you can plan accordingly." }, "name" : "Can I stay in my house during slab leak repair?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Not reliably. Standard home inspections are visual and won't detect a leak buried beneath concrete. If you're purchasing a home in Acadiana built before 1990, it's worth requesting a dedicated plumbing inspection that includes a water meter test and, if warranted, a camera or pressure evaluation of the underground lines." }, "name" : "Will a slab leak show up on a home inspection?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "It depends on your policy and the cause of the leak. Many policies cover resulting water damage to flooring, drywall, and personal property, but not the pipe repair itself. Some policies exclude gradual leak damage entirely. Review your policy with your insurance provider before repairs begin, and document all visible damage with photos first." }, "name" : "Is a slab leak covered by homeowners insurance?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "A straightforward spot repair can typically be completed in one day once the leak is located. A pipe re-route or NuFlow trenchless lining project may take one to three days depending on the scope. The detection process using acoustic sensors and pressure testing is usually completed within a few hours." }, "name" : "How long does slab leak repair take?" } ] } ```