Back to Blog

What Is a Slab Foundation Leak?


Plumbing Experts in Timberwood Discuss Fixing Foundation Leaks

How Foundations Leak

Foundation leaks can come from water both inside and outside a house, but interior slab leaks are often more difficult to find, fix and diagnose. Exterior leaks occur when water seeps into the foundation from the outside. Interior leaks are when a part of the water line or sewage line is leaking on the inside. These types of leaks can waste water and cause extensive damage to a home.

A good plumber will work to discover the causes and can help avoid further damage or even more costly repairs. Learn more below about the waste, damage and methods of fixing a slab foundation leak. 

Throwing Water Down the Drain 

An average household uses 80-100 gallons of water a day, or about 700 gallons a week. Serious toilet leaks can shoot that up to over 4,000 gallons of water a day. If the leak exists on one of the larger supply lines, that number could be even higher. 

The amount of money wasted as a result depends on local rates and the size of the leak, but it can add up fast! In fact, one of the first signs of a slab leak is often a higher than usual water bill for no discernable reason. When left unchecked these leaks can add up to thousands of dollars worth of water.

Property and Structural Damage

Besides wasting water, leaks under a slab can cause some serious damage to a home. If the water leaks for long enough, it can cause the entire house to shift. Water soaks the ground enough that the weight of the house shifts, and can cause severe structural damage and lead to expensive foundation repairs. 


Mold can grow if the leak persists, which requires expensive mitigation to be safe. And that’s not including flooring and personal property damage. Recovering from any type of flooding is expensive and bothersome, even before calculating the repair costs. 

Service Steps to Fixing Foundation Leaks

The first step a plumber will take when assessing a slab leak is deciphering where the leak is coming from. Sometimes the damage is obvious, but oftentimes they will scope a sewer line to try and find a leak. For water lines, they eliminate piece by piece, working from main lines to smaller lines and comparing hot vs cold lines. Since access to these pipes is under concrete, they will listen to the lines and valves, trying to hear the sound of leakage. 

Once discovered, the concrete over the pipes is removed and repairs can be made. Depending on the age and condition of the pipes it may make more sense to simply replace them all and avoid future leaks. 

These types of services can be expensive, but they are nowhere near as expensive as the long term damage they can do when unchecked, or the damage caused when they develop into a larger leak that floods. Fixing or preventing a slab leak will always be cheaper in the long run because it avoids potentially expensive foundation repairs.

Trust a Local Plumber 

John and Robert Freund started plumbing over 50 years ago and their children still run Primo Plumbing Inc today. With a strong focus on customers, they provide honest feedback about custom options for any given plumbing situation. Primo Plumbing Inc is a full-service plumbing company which provides slab leak repair in Timberwood Park and works on both residential and commercial properties.

financing available

  • Buy Now – Pay Over Time
  • convenient monthly payments
  • Quick Credit Decisions


  • Bi-annual/planned maintenance
  • Priority Service Call and Scheduling
  • Discounts on Parts & Labor

Meet The Team

Our team of experts dedicated to delivering amazing service.
employee matthew freund smiling for the camera
employee patrick freund smiling for the camera
Employee Tom Freund smiling at the camera
employee clint wurzbach smiling for the camera
employee mike stahl smiling for the camera
employee matthew freund smiling for the camera
employee patrick freund smiling for the camera
Employee Tom Freund smiling at the camera
employee clint wurzbach smiling for the camera
employee mike stahl smiling for the camera

Over 50 Years Of Five Star Service

Excellent customer service!

I was so pleased with the excellent customer service provided by Luis, Eric, Camillo and Mark. Also, your Customer Service Accounts Payable was so sincere and efficient. I would and will always recommend Comfort Air to anyone.

Suzy H.

Very dependable!

I've been a customer of Comfort-Air Engineering Inc for about ten years. I like them because they are very dependable. When I call them, they come out. A few years ago, they installed a new heating and air conditioning system for…

Robert H.

Real professional job!

Replacing faucets throughout house was no problem for these pros, even though there were a variety of fittings they had to deal with. Showed up on time and worked efficiently. Real professional job at a reasonable price.

Bob K.

We wouldn't trust any other!

We have always appreciated your family owned and operated business. We have been with your company for approximately 20 years and wouldn’t trust any other.

Gwen R.

On time, professional and courteous!

Comfort-Air Engineering Inc. recently installed a generator for us and they also did some plumbing work. This was our first experience with the company. They were on time, professional and courteous. Moreover, they did exactly what we asked them to do…

David A.