A slab leak is an industry term used to describe a leak that has developed in the copper water lines running below the concrete foundation of your home. When these same leaks are above ground, in the wall or ceiling, they are known as pinhole leaks. Such leaks are often a result of long-term corrosion to copper pipes. Slab leaks can be found either on the pressure side or the drainage side of your foundation. If the slab leak is on the pressure side of the water system, it can typically be unearthed prior to triggering a lot of destruction. While these leaks are usually found quickly, they can cause significant damage. Leaks on the drainage side can be considerably more veiled, making them trickier to spot. They can leak for ages, showing no external indication. Over time, slab leaks can damage hardwood floors and carpet as well as drywall and cabinets if not taken care of. Moisture left on its own for over 24 hours can even start mold and fungus problems. To stop this from happening, the plumbing must be examined frequently by a professional who knows how to diagnose and repair slab leak issues.

What Does a Slab Leak Look Like?

Ground/Foundation Shifts Sometimes, slab leaks occur as the result of your house shifting on its foundation. When the ground of your home starts to shift, your pipes are bound to experience a little pressure. However, while pipes are strong and can withstand a lot of things, too much pressure can really take a toll and cause them to leak.

Signs You Have a Slab Leak

Sudden spikes in your water bill The sound of running water when pipes aren’t in use Moisture or mildew under carpeting A moving water meter dial when pipes aren’t in use Standing water around the perimeter of your house Unusually low water pressure Cracks in your baseboard or walls Damp or warm floors Mold Problems / Moldy smell If you suspect you may have a slab leak in your home, call Barker and Sons Plumbing & Rooter at (714) 452-1380 for professional slab leak detection and repair. If there is a slab leak present, we may recommend capping off existing pipes using durable and flexible PEX piping if the leaks are extensive or hard to reach rather than performing a complete pipe replacement.

Slab Leak FAQs

Q: How Long Can a Slab Leak Go Undetected?

Since slab leaks are not clearly visible to a homeowner, they can often go undetected for long periods of time. Leaving a potential slab leak unattended can lead to much larger problems, such as mold damage and termite infestation. With that said, you can look out for more subtle signs that may indicate you have a slab leak.

Q: What Causes a Slab Leak?

Pre-Damage & Poor Installation It’s not unusual for some materials to get a little banged up when building a home, but if it’s the pipes that experience any damage, it could cause problems in the long run. Furthermore, if the pipes are installed incorrectly from the start, there’s a good chance that they won’t be able to function properly once they have an entire house sitting on top of them. Abrasion Pipes naturally expand and contract as water flows throughout them, but doing so can cause trouble depending on how your home was built. If the pipes are in a place where they are exposed to concrete, gravel, even other pipes, they could start to rub against them (until they eventually wear down) if they don’t have enough room to expand. Corrosion Since these pipes are located underground, it’s only natural for them to come into contact with soil. However, the addition of soil can cause the pipes to corrode over time. This is very common in home plumbing systems with copper pipes.

See Specials

Slab Leak FAQs for Orange County & Anaheim Homeowners

Orange County homes sit almost entirely on concrete slab foundations – and with Anaheim’s municipal water running at roughly 15 grains per gallon, our region’s very hard water is one of the top drivers of copper pipe corrosion and slab leak formation. It’s a combination that makes slab leaks far more common here than in most parts of the country, and one that homeowners in Anaheim and across Orange County deal with more often than they realize. If your home was built before 1980, your pipes may already be showing early signs of stress. Barker & Sons has been detecting and repairing slab leaks across Orange County for over 35 years, backed by 4,277 Google reviews at 4.8 stars – and we’re available 24/7 when you need us most.

What Is a Slab Leak?

A slab leak happens when a water supply or drain line running beneath your home’s concrete foundation develops a leak. Because the pipes are buried under several inches of concrete, these leaks can go unnoticed for months while causing serious damage to your foundation, flooring, and walls.

In Orange County, the most common source of slab leaks is the copper supply lines found in homes built before 1980. Those original pipes – now 45 years old or more – are highly vulnerable to the kind of corrosion that our local water conditions accelerate over time.

Why Are Slab Leaks So Common in Orange County?

Two factors make Orange County homes especially prone to slab leaks – and they work together.

First, nearly all homes in Southern California are built on concrete slab foundations. In fact, approximately 95% of new single-family homes in the Southwest use slab construction, according to U.S. Census Bureau data. That means the supply pipes in most OC homes run directly beneath a layer of concrete rather than through a crawlspace or basement.

Second, Anaheim’s municipal water supply – sourced from the Santa Ana River basin – has a hardness of approximately 15 grains per gallon, which is classified as very hard. The elevated calcium and magnesium levels in that water react with copper pipe walls through a process called electrochemical corrosion. Over time, this gradually thins the pipe’s interior, creating pinhole leaks. When those pinhole leaks occur in pipes running under your slab, you have a slab leak.

Add in the fact that the Newport-Inglewood fault zone runs through Orange County, and seismic ground movement becomes an additional stressor on buried pipes that many homeowners never think about.

No competitor page in this space connects those dots for Orange County homeowners. We do – because we’ve seen it firsthand for over three decades.

What Causes a Slab Leak?

The most common causes of slab leaks in OC homes include:

Hard water corrosion – Anaheim’s ~15 GPG water supply accelerates corrosion in copper lines, leading to pinhole leaks beneath the slab
Aging pipes – Homes built before 1980 often still have original copper supply and cast iron drain lines that are well past their reliable service life
Ground movement – Seismic activity and soil shifting from the Newport-Inglewood fault zone can crack or stress buried pipes
Abrasion – Pipes that rub against concrete, gravel, or other pipes wear down over time, especially at bends and joints
High water pressure – Excessive pressure puts ongoing stress on joints and pipe walls, accelerating wear

The corrosion path in the copper pipe is worth understanding in detail. Orange County’s hard water carries dissolved minerals that react with the pipe interior through an ongoing chemical process. This isn’t a sudden failure – it builds slowly over years. By the time symptoms appear at the surface, the damage beneath the slab has often been developing for months.

Signs You May Have a Slab Leak

In Orange County homes with aging copper supply lines, these warning signs can appear gradually. Don’t wait until you see visible water damage.

Watch for:

Unexplained increases in your water bills
The sound of running water when all fixtures are off
Warm or hot spots on your floor (from a hot water line leak)
Damp, wet, or warped flooring
Mold or mildew smell without a visible source
Cracks appearing in your walls or flooring
Low water pressure throughout your home
Soft or sunken spots in your yard near the foundation
Foundation settling or visible cracks in the slab

Any one of these is worth investigating. A combination of two or more is a strong signal to call a licensed slab leak specialist right away.

How to Tell If You Have a Slab Leak

Noticing the warning signs is the first step – but confirming a slab leak is a job for a licensed professional with the right equipment. Attempting to locate a slab leak by opening concrete without a proper diagnosis can cause unnecessary damage and drive up repair costs.

Here’s what the detection process looks like when you call Barker & Sons:

We start with a pressure test to confirm there is in fact a leak in your supply or drain line
From there, we use electronic leak detection equipment and acoustic listening devices to pinpoint the exact location of the leak beneath the slab – without cutting any concrete
Once the leak is located, we walk you through the findings and your repair options before any work begins

The whole process is non-invasive and designed to give you a clear picture of what’s happening under your foundation. In Orange County homes with aging copper lines, early detection through professional testing is almost always less expensive than waiting until visible damage forces the issue.

How Long Can a Slab Leak Go Undetected?

A slab leak can go undetected for weeks or even months. Because the pipes are buried under concrete, there’s no visible dripping – and in OC’s dry climate, moisture doesn’t always surface quickly. Orange County’s hard water corrosion is a slow-acting process, which means the pinhole leak causing the problem may have developed gradually long before any symptoms appear at the surface.

This is why early detection matters so much. The longer a slab leak runs, the more water works into your foundation, subfloor, and walls – turning a repair into a much larger remediation project.

What Are My Options for Repairing a Slab Leak?

Once a slab leak is confirmed, there are three main repair approaches. The right one depends on the location of the leak, the condition of your pipes, and the age of your home:

Spot repair (open repair) – The most direct method. Our team opens a small section of the slab directly above the leak, repairs or replaces the pipe in that section, and patches the concrete. Best for isolated leaks in otherwise healthy pipes.
Pipe rerouting (repiping) – If your pipes are aging or corroded throughout, rerouting runs entirely new lines through the walls or ceiling rather than through the slab. This avoids repeated spot repairs on deteriorating pipes.
Epoxy pipe lining – A trenchless option in which an epoxy coating is applied inside the existing pipe to seal the leak from within. No concrete cutting required. Best suited for pipes that are structurally sound but experiencing pinhole leaks.

For a full breakdown of each approach and pricing guidance, visit our slab leak repair page.

Why Orange County Homeowners Trust Barker & Sons for Slab Leaks

When you’re dealing with a slab leak, you want a plumber who knows Orange County – not just a technician who happens to be available. Barker & Sons is a locally rooted plumbing company based in Anaheim, and we’ve been serving this community for over 35 years.

Here’s what sets us apart:

4,277 Google reviews at 4.8 stars – the largest verified review count of any plumber serving this area
1,737 Yelp reviews – consistent five-star service across platforms
24/7 emergency availability – slab leaks don’t follow a 9-to-5 schedule, and neither do we
Licensed and insured – fully compliant with California state licensing requirements
PHCC Contractor of the Year – recognized by the Plumbing-Heating-Cooling Contractors Association for excellence in the trade

We know Orange County’s water, housing stock, and soil conditions because we work here every day. That local knowledge shows up in every diagnosis we make.

Slab Leak FAQs

Are Orange County homes more likely to develop slab leaks than homes in other regions?

Yes – nearly all Southern California homes sit on concrete slab foundations, and OC’s very hard water (~15 GPG) accelerates copper pipe corrosion, which is the leading cause of slab leaks in the area.

How do I know if my home is at higher risk for a slab leak?

If your Anaheim or Orange County home was built before 1980, your original copper supply lines are likely 45+ years old and may already show signs of corrosion, putting your home at elevated risk.

Can a slab leak damage my foundation?

Yes. Ongoing water intrusion beneath a concrete slab can erode the soil supporting the foundation, leading to settling, cracking, and structural shifts over time.

How quickly can Barker & Sons respond to a suspected slab leak?

We offer 24/7 emergency service throughout Orange County and Anaheim – call us and we’ll get a licensed technician to your home as quickly as possible.

What’s the difference between slab leak detection and repair?

Detection identifies the exact location and source of the leak using electronic or acoustic equipment without opening any concrete. Repair is the physical fix, which may involve spot repair, rerouting, or epoxy lining depending on the situation.

Will I need to leave my home during a slab leak repair?

In most cases, no. The scope of disruption depends on the repair method chosen, and our technicians will walk you through exactly what to expect before any work begins.

Does homeowner’s insurance cover slab leak repair?

Coverage varies by policy – most standard policies cover the resulting water damage but may not cover the cost of accessing or repairing the pipe itself. We recommend contacting your insurance provider directly and can assist with documentation if needed.