What are the symptoms of a slab leak?

Author: Alexander Goodwin  |  Last update: Wednesday, October 15, 2025

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.

How can I tell if I have a slab leak?

To determine whether this is the problem, close all the running taps in the house and listen to any sound that might come from the walls. Check the water meter located on the wall. If you see the pointer running, it means there is a hidden running source, which could mean a slab leak.

How long can a slab leak go undetected?

These water leaks start off invisible to the eye and go undetected for weeks or even months, they can cause hidden water damage and mold. After 72 hours after a water leak mold can start to grow, thriving in damp, dark places like behind cabinets and between walls.

Does homeowners insurance cover a slab leak?

If a peril that's covered by your homeowners insurance policy results in a plumbing leak under your slab creating a slab leak, your homeowners insurance policy might help pay to tear out and replace the slab and repair the water damage to your home.

Where does the water go when you have a slab leak?

When slab leaks occur, water seeps into the ground, exacerbating soil expansion and increasing the risk of structural damage. The resulting hydraulic pressure can enter cracks in the foundation, leading to visible damage such as wet floors, cracks, or even flooding.

Slab Leaks: Warning Signs To Look Out For

How much does it cost to fix a slab leak?

The average cost of slab leak repair is $2,300. * Depending on the extent of the problem, repairs may cost as little as $630 or as much as $4,400 or more. The location of the leak is the most relevant factor to cost because this determines how difficult it is to access and repair the leak.

Should you turn off the water if you have a slab leak?

Turn off the Water: The first thing you should do if you suspect a slab leak is to turn off the water supply to your home. This will prevent any additional water from leaking into your home and causing more damage.

What happens if you don't fix a slab leak?

Foundation Damage

Ignoring a slab leak can spell disaster for this crucial structure. As water seeps into the ground beneath your foundation, it causes the soil to shift and erode, compromising the stability of your home.

Can pipes burst under slab?

When a water pipe leaks or bursts under the concrete foundation, this is a slab leak. Often, a homeowner does not even realize water is leaking under and around the slab. These leaks can cause a list of problems, and eventually, the damage can evolve into structural instability and collapse.

How do I make a successful water leak insurance claim?

7 Tips when Filing a Home Insurance Claim for Water Damage
  1. Step 1: Determine the Source of the Water. ...
  2. Step 3: Call your Insurance Agent. ...
  3. Step 4: Get the water and moisture professionally removed. ...
  4. Step 5: Determine if you can remain in your home. ...
  5. Step 6: Take photos of the damaged area. ...
  6. Step 7: Contact an Adjuster or Lawyer.

Is a slab leak an emergency?

The urgency of addressing a slab leak lies in its potential to cause substantial damage to your home's foundation, leading to structural issues and increased repair costs. Ignoring the signs or delaying repairs can exacerbate the situation, turning a manageable issue into a critical emergency.

How do you diagnose a foundation leak?

Signs of Foundation Leaks
  1. Check the Track Strip. A telltale sign of a foundation water leak is rust or rot on your carpet tack strip. ...
  2. Try a Water Test. ...
  3. Look Out for Efflorescence. ...
  4. Check For Perimeter Leaks. ...
  5. There's a Random Spike In Utility Bills. ...
  6. Check for Damp Floors. ...
  7. Look Out for Mold or Mildew. ...
  8. Insulate Pipes.

How long before a leak causes damage?

24 to 72 Hours: After that initial day, the impact grows significantly. Wooden elements and drywall can be impacted and warped, and metal surfaces may begin to corrode. An odor may be present, and it is essential to act before damages become more complicated and costly.

How common are leaks under slab?

Homes with older plumbing, especially those with aging copper pipes, are more vulnerable to corrosion, which can lead to slab leaks over time. While slab leaks are not an everyday occurrence, they are common enough that homeowners should be vigilant and watch for the signs to avoid extensive damage.

How to respond if you suspect you have a slab leak?

If you suspect that you are dealing with a slab leak, the first thing you need to do is call a slab leak repair specialist. These experts can diagnose the problem quickly and pinpoint the location of the leak using modern equipment such as electronic listening tools and line-tracing equipment.

How do plumbers test for leaks?

The plumber attaches a water pressure gauge to a faucet or fixture connection, turns the fixture on to pressurize the gauge, and turns the water meter off to observe the gauge pressure. If the gauge's pressure decreases, there's likely a leak in the system.

Do insurance companies pay for slab leaks?

If the slab damage occurs as a result of a covered event, your insurance company can pay for the removal of the slab and repairs to it. Furthermore, the personal property coverage part of your policy may come into play if your slab leak leads to water damage to your belongings like your furniture.

How much does it cost to repair a slab leak?

According to HomeAdvisor, the national average of a slab leak repair job is about $2,280. Meanwhile, the average cost of a simple pipe repair is about $630. On the high end, however, repairs may be up to $10,000 or more if total repiping and damage remediation, such as mold or asbestos abatement, are required.

What are the signs of a slab leak?

5 Signs of Slab Leaks in Your Home
  • Hot Spot on Flooring. One of the first methods of slab leak detection is noticing a persistently hot area of your floor. ...
  • Water protrusion from slab or ground. ...
  • Stoppage or backup of toilets, tubs, and showers. ...
  • Foundation movement or cracking. ...
  • Unexplained odor.

What is the best solution for slab leakage?

Polyurethane Waterproofing Treatment

Pidilite developed products like Dr. Fixit PU Foam Injection, Dr. Fixit PU Plain Injection and Dr. Fixit Novolac Clear among others can be used for waterproofing concrete slabs on the roofs, floors, and basements of residential and commercial properties.

Can heavy rain cause slab leak?

Heavy April rains don't have to cause weight on your pipes directly to cause a leak. They can also help shift the soil and move the very foundation of your house. A slab leak of this kind occurs when the house foundation moves but the underground plumbing stays in place.

How urgent is a slab leak?

Ignoring a slab leak can cause problems that take a toll on your property and checkbook. Even if you do not notice a spike in your water bill right away, slab leaks eventually cause other problems. For example, these leaks can cause extensive mold growth that create health implications for those who live in the home.

Is it better to repair a slab leak or Repipe?

One of the most significant benefits of repiping for a slab leak is the long-term solution it provides. Repiping involves replacing all the pipes under the slab, eliminating the need for future repairs. This can provide homeowners with peace of mind and save them money in the long run.

What is the best way to fix a slab leak?

How to Fix a Slab Leak: The Top Four Ways
  1. Jack-Hammer the Slab. The key step for this type of repair is accurately locating the leak. ...
  2. Tunnel Under the House. Digging a tunnel is the least invasive way (for the interior of the home) to make the repair. ...
  3. Re-Route Through the Attic. ...
  4. Pass-Through the Old Line.

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