Answers to the most common questions about slab leaks from Evans Leak Detection — serving Orange County, Riverside, and South LA for over 50 years.
Think you have a slab leak? Call Evans Leak Detection now at (949) 855-1032. Free estimate. Flat rate pricing. Available 24/7.
What is a slab leak?
A slab leak is a leak that develops in the water pipes running beneath the concrete foundation of your home. These pipes carry both hot and cold water, and when they fail — due to corrosion, soil movement, or friction — water escapes into the ground below your slab. Over time, that water fills air pockets in the soil and eventually pushes upward through your foundation. Slab leaks can affect freshwater supply lines or sewer lines and, if left undetected, can cause serious structural damage, mold growth, and dramatically increased water bills. In Southern California, slab leaks are extremely common as homes age and their plumbing systems wear down.
How do I know if I have a slab leak?
The most common warning signs of a slab leak in your Orange County home include: the sound of water running when all fixtures are turned off, warm or hot spots on your floor, a sudden unexplained increase in your water or gas bill, moisture or damp spots seeping up through your flooring or carpet, cracks appearing in your walls or foundation, low water pressure, and a musty or mildew smell coming from floors or baseboards. If you notice any of these signs, do not wait — call Evans Leak Detection immediately at 949-855-1032. The only way to confirm a slab leak and pinpoint its exact location is through professional electronic leak detection.
What causes slab leaks?
Slab leaks are caused by a variety of factors. The most common in Orange County homes are: corrosion of copper pipes over time due to contact with soil and minerals in the water, abrasion from pipes rubbing against concrete, gravel, or other pipes without adequate room to expand, soil shifting beneath the slab that stresses and cracks pipe joints, and poor original pipe installation. Hot water lines are especially vulnerable because they expand and contract with temperature changes, creating ongoing friction against the concrete. Homes built before the 1980s are particularly prone because older plumbing codes allowed for T-joints and elbows directly under the slab, which are common failure points.
How common are slab leaks in Orange County, CA?
Slab leaks are extremely common in Southern California, including Orange County, Riverside, and the surrounding areas. If you own your home long enough, the likelihood of experiencing at least one slab leak is very high. As homes age, pressurized water systems wear down and eventually fail. The soil composition in Southern California — a mix of sand, gravel, and clay that shifts and settles unevenly over time — puts additional stress on underground pipes. Evans Leak Detection has been serving Orange County homeowners for over 50 years and has repaired thousands of slab leaks throughout the region.
How long can a slab leak go undetected?
A slab leak can go unnoticed for anywhere from several months to a full year. Many homeowners set their water bills on autopay and never notice the gradual increase in usage. Because the leak is underground and under the slab, there may be no visible signs for a long time as the water fills air pockets in the soil beneath the foundation. Most water companies now have technology that can flag water running continuously in a home 24/7, which has made earlier detection more common. However, the safest approach is to call a professional if you notice any warning signs — the longer a slab leak goes untreated, the more damage and costs accumulate.
Where does the water go when you have a slab leak?
When a pipe leaks under your slab, the water travels the path of least resistance through air pockets in the soil beneath your foundation. During construction, bulldozers and road graders level and mix sand, gravel, and clay, creating natural air pockets under every slab. Water fills these pockets gradually, eventually building enough pressure to push upward against the bottom of the concrete slab. That is typically when homeowners first notice moisture seeping up through their flooring or carpet. Once the leak is stopped, time and gravity allow the accumulated water to percolate back down into the earth. The only solution is to stop the leak at its source as quickly as possible.
Should I turn off the water if I have a slab leak?
Yes — turning off your water when you suspect a slab leak is always a good idea. The less water flowing under your slab, the more opportunity there is for gravity to pull that water back into the earth and away from your foundation. When you turn off your main water supply, no special precautions are needed. However, when turning the water back on, always open a faucet at a nearby sink first to relieve pressure, then turn the main line on slowly and gradually until the system is fully re-pressurized. Turning the main line on quickly can cause a water hammer — a sudden pressure surge — that could damage appliances like dishwashers, water heaters, or ice makers.
Can a slab leak damage my home’s foundation?
Yes — a slab leak that goes untreated long enough can cause serious structural damage. As water saturates the soil beneath your foundation, it can erode the support structure, cause the slab to shift, crack, or heave, and weaken the structural integrity of your home. You may notice cracks appearing in walls, flooring, or the foundation itself as a result. Beyond structural damage, prolonged moisture creates ideal conditions for mold and mildew to grow inside your walls and under your flooring, which poses health risks. This is why prompt detection and repair is critical — the longer a slab leak is left untreated, the more extensive and expensive the resulting damage becomes.
What does slab leak detection involve?
Professional slab leak detection uses electronic equipment to accurately locate the source of a leak without breaking into your slab or opening your walls unnecessarily. At Evans Leak Detection, technicians use acoustic listening devices that detect the sound of pressurized water escaping from a pipe deep beneath your foundation. This non-invasive process allows our specialists to pinpoint the exact location and depth of the leak before any repair work begins. Knowing the precise location saves time, reduces destruction, and lowers the overall cost of repairs. Evans Leak Detection offers a free estimate and performs leak detection without destruction — we find your leak without the need of a jackhammer.
How does electronic leak detection work?
Electronic leak detection uses acoustic principles to find hidden leaks. Specialized listening equipment amplifies and registers the sound of water escaping from a pressurized pipe — even when that pipe is buried beneath a concrete slab. Technicians move the listening device across the floor surface, mapping the sound signature to triangulate the leak’s precise location. This method is accurate, fast, and non-invasive. At Evans Leak Detection, our technicians have over 50 years of combined experience using these tools, and their deep knowledge of how homes from different eras were plumbed means they can accurately interpret what the equipment is telling them — reducing false positives and unnecessary destruction to your home.
How much does slab leak detection cost in Orange County?
Professional slab leak detection in Orange County typically costs between $150 and $400, depending on the complexity of the job and the technology required to locate the leak. This covers the diagnostic process only — using electronic acoustic equipment to pinpoint the exact location of the leak beneath your slab. Evans Leak Detection offers a free estimate over the phone before anyone comes to your home. Call 949-855-1032 and speak directly with Ron or Pat — no obligation, no commitment. With Evans’ flat rate model, the detection cost is rolled into the total job price so there are no separate surprise line items when the bill arrives.
How much does slab leak repair cost in Orange County?
According to Angi and HomeAdvisor, the average full slab leak job — detection plus repair — runs between $2,000 and $5,000 for most homeowners, with complex repairs involving direct slab access or a whole-house repipe reaching $6,750 or more. California labor costs consistently push prices toward the higher end of national ranges. Evans Leak Detection removes the guesswork with flat rate pricing — one firm price for the complete job, no hidden fees, no charges added after the fact. Your technician will assess the situation, walk you through all available repair options, and give you a price before any work begins. Call 949-855-1032 for a free phone estimate.
What are the repair options for a slab leak?
Traditional providers offer one method to repair slab leaks: jackhammer and floor disruption. We offer something better. Once a slab leak has been detected and located, Evans Leak Detection offers several repair options depending on the location, nature, and severity of the leak, as well as the age and construction of your home. The four main methods are: pipe re-route (redirecting the line through the attic or crawl space), pass-through (running a new PEX pipe inside the existing copper pipe), direct access (breaking through the slab to reach the pipe directly), and epoxy pipe lining (coating the interior of the pipe with epoxy resin). Your Evans technician will explain the pros and cons of each option and recommend the most appropriate and least invasive solution for your specific situation.
What is a pipe re-route and when is it used?
A pipe re-route involves permanently bypassing the leaking section of pipe by running a new line through an alternative path — typically through the attic, crawl space, or along a wall to the nearest manifold. The leaking section under the slab is isolated and removed from the plumbing system entirely. Re-routing is one of the most common and cost-effective slab leak repair methods because it avoids breaking through the slab and minimizes drywall damage. Evans Leak Detection technicians will map out the optimal rerouting plan for your home and discuss all available pathways with you before proceeding. The result is a fully functioning plumbing line that never touches the slab again.
What is a pass-through repair for a slab leak?
A pass-through repair is the least invasive slab leak repair method available. It involves cutting the leaking copper pipe at both its entrance and exit points, then threading a smaller-diameter PEX pipe through the full length of the existing copper pipe and reconnecting to the plumbing system at both ends. The advantage is minimal disruption — drywall is only opened at the entry and exit points, which are often under sinks or vanities where repairs are hidden from view. The trade-off is a slight reduction in water flow due to the smaller diameter of the new pipe. On larger pipes (¾ inch and up), this flow reduction is barely noticeable. Evans recommends this method whenever the pipe layout allows for it.
What is direct access slab repair and when is it necessary?
Direct access involves using tools such as a jackhammer to break through the concrete slab to reach and repair the leaking pipe directly. Evans Leak Detection considers this the most invasive method and avoids it whenever possible. Modern California building codes no longer allow T-joints or elbows directly under slabs, so newer homes rarely require this approach — rerouting or a pass-through is usually sufficient. However, many older Orange County homes were built with T-joints and elbows positioned directly beneath the slab, and in those cases, direct access may be the only viable repair option. Even when direct access is required, Evans technicians prioritize minimal disruption and precise excavation to limit the area of concrete that needs to be removed.
What is epoxy pipe lining and when does Evans recommend it?
Epoxy pipe lining involves coating the interior surface of a damaged pipe with epoxy resin, sealing pinholes and corrosion from the inside. It is a durable solution that avoids opening walls or breaking through floors. However, Evans Leak Detection recommends this method only in specific situations because epoxy has limitations when applied to horizontal pipes under a slab — the liquid resin pools at the bottom of horizontal runs, resulting in uneven coverage and a reduced internal diameter that restricts flow. Epoxy lining works best for vertical pipes and is recommended in limited scenarios such as kitchen islands where opening the floor is not feasible and a pass-through is not possible. Your technician will tell you whether this method is appropriate for your specific leak.
What is a whole-house repipe and when is it recommended?
A whole-house repipe replaces all of the existing supply lines in your home with new piping — typically PEX or copper — run through walls, ceilings, and crawl spaces rather than under the slab. Evans Leak Detection recommends a full repipe when a home has older pipes (50+ years), has experienced multiple slab leaks, or when the existing plumbing system is clearly at or near end of life. Repiping eliminates the risk of future slab leaks entirely by removing the original underground lines from service. While it is a larger investment than a single repair, it is often the most cost-effective long-term solution for older Orange County homes. Evans uses American-made materials and offers a 5-year warranty on repipe work.
How long does slab leak repair take?
Most slab leak repairs in Orange County can be completed in a single day. A straightforward re-route or pass-through typically takes a few hours from start to finish. More complex repairs, such as direct access through the slab or a whole-house repipe, may require additional time — but Evans Leak Detection technicians are experienced and efficient, and they will give you a realistic timeline before work begins. Customers consistently note in reviews that Evans completes jobs on schedule and on budget with no surprise charges. If drywall repair is needed after the plumbing work, Evans can refer you to trusted drywall contractors who can often complete that work the same day or the following day.
Does homeowner’s insurance cover slab leaks in California?
Homeowner’s insurance coverage for slab leaks varies by policy. In California, most standard homeowner’s policies cover the cost of accessing the leak (such as breaking through the slab) and repairing the resulting water damage, but they typically do not cover the cost of the pipe repair itself. Some policies also cover mold remediation if the leak caused mold growth. It is important to review your specific policy and contact your insurance carrier as soon as you discover a slab leak to understand what is covered. Evans Leak Detection can provide documentation of the leak location, detection process, and repair method to support your insurance claim. Call 949-855-1032 to get started.
Will delaying a slab leak repair affect my insurance claim?
Delaying a slab leak repair can jeopardize your insurance claim. Most homeowner’s insurance policies include a clause requiring the homeowner to take reasonable steps to prevent further damage once a problem is discovered. If an insurance adjuster determines that damage was worsened by neglect or delayed action, your claim may be reduced or denied. This is another important reason to call Evans Leak Detection as soon as you notice warning signs — prompt action protects both your home and your insurance coverage. Evans is available 24 hours a day, 7 days a week and can respond quickly to minimize damage and provide documentation for your insurer.
Can slab leaks cause mold in my home?
Yes — slab leaks are a leading cause of mold and mildew growth in Orange County homes. When water seeps up through your foundation and into your flooring, subfloor, baseboards, or walls, it creates a persistently damp environment that is ideal for mold spores to thrive. You may notice a musty or earthy smell before you ever see visible mold. Once mold establishes itself inside walls or under flooring, remediation can be expensive and disruptive. This is why early detection is so important — the sooner the leak is stopped, the less moisture accumulates, and the lower the risk of significant mold damage. If mold has already developed, Evans can refer you to qualified remediation professionals in the Orange County area.
Can I prevent future slab leaks?
While it is impossible to completely eliminate the risk of future slab leaks in an aging home, there are proactive steps you can take to reduce that risk and catch problems early. The most effective solution Evans Leak Detection offers is the installation of Flo by Moen — a smart water monitoring system that watches your home’s plumbing around the clock and alerts you to abnormal water flow patterns that may indicate a leak. This system can detect issues at their earliest stage, long before a leak becomes a major problem. For older homes that have already experienced one or more slab leaks, a whole-house repipe is often the most definitive way to eliminate the risk of future slab leaks altogether.
What is Flo by Moen and how does it help prevent slab leaks?
Flo by Moen is a smart home water monitoring device that installs on your main water line and monitors your entire plumbing system 24 hours a day, 7 days a week. It tracks flow rate, pressure, and temperature, learning your home’s normal usage patterns over time. When it detects an anomaly — such as water running continuously overnight or an unusual pressure drop — it sends an alert to your smartphone. In serious situations, it can automatically shut off the water supply to prevent further damage. Evans Leak Detection is an authorized installer of Flo by Moen and recommends it as an additional layer of protection after any slab leak repair. It is one of the most cost-effective investments an Orange County homeowner can make.
Why are slab leaks so common in older Southern California homes?
Slab leaks are particularly prevalent in older Southern California homes for several reasons. First, homes built in the 1950s through 1980s used copper supply lines routed directly under the concrete slab, often with T-joints and elbows at vulnerable points. Over decades, those copper pipes corrode due to contact with the soil, minerals in the water supply, and electrochemical reactions. Second, Southern California’s soil — a mixture of sand, clay, and gravel — shifts and settles unevenly over time, stressing pipe joints and connections. Third, hard water in the region accelerates internal pipe corrosion. Evans Leak Detection has deep expertise in the plumbing systems specific to older Orange County homes and understands the unique failure patterns associated with each era of construction.
Why should I choose Evans Leak Detection for my slab leak in Orange County?
Evans Leak Detection brings over 50 years of owner-operated experience to every slab leak job in Orange County, Riverside, and South LA counties. Unlike large plumbing chains, Evans is owner-operated — you speak directly with Ron or Pat when you call, and the same trusted technicians handle your job from detection through repair. Evans uses the latest non-invasive electronic detection technology to find your leak without unnecessary destruction. All work is performed at a flat rate — one price, no hidden fees, no surprises. Evans is available 24 hours a day, 7 days a week, and backs every job with a 100% satisfaction guarantee. If you are not completely satisfied, they will send a specialist back to make it right at no charge. Call 949-855-1032 today.