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What Is a Slab Leak, and How Bad Is It?
What Is a Slab Leak, and How Bad Is It?
4.8 RATING

What Is a Slab Leak, and How Bad Is It?

In simple terms, a slab leak occurs when a water pipe breaks or cracks underneath a concrete slab foundation. In other words, it is a…

August 07, 2026
What Is a Slab Leak, and How Bad Is It?

In simple terms, a slab leak occurs when a water pipe breaks or cracks undeeath a concrete slab foundation. In other words, it is a leak that develops in the pipes running below the concrete foundation of a home. Slab leaks are a common problem in homes with concrete slab foundations, and they can cause serious damage to your home. Unlike leaks in visible plumbing fixtures, slab leaks don't present obvious signs like water pooling or dripping. This makes it harder for homeowners to identify a problem.

Causes of Slab Leaks

There are several factors that can cause slab leaks, including:

  • Age of the pipes: Just like other components of your plumbing system, pipes can corrode and weaken over time, making them more susceptible to cracking.
  • High water pressure: High water pressure can put stress on pipes, causing them to crack or break. Water pressure above 80 psi is considered too high.
  • Tree roots: Tree roots can grow into and damage pipes.
  • Shifting soil: Shifting soil can put pressure on pipes, causing them to crack or break.
  • Poor water quality: Excessively acidic or alkaline water can corrode pipes and result in water leaks over time.
  • Improper installation: Pipes that are not installed properly can be more susceptible to leaks.

Signs of a Slab Leak

It’s important that you know the waing signs of slab leaks so you can take quick action to prevent further damage and save money. Here are some of the telltale signs of a slab leak:

  • Your water bill has suddenly increased without any change in your water usage.
  • Low water pressure.
  • Warm or damp spots on your floor.
  • You hear the sound of running water even when no faucets are running.
  • Cracks in the foundation.
  • A settling or shifting foundation could mean that a slab leak is causing the soil under your foundation to erode.
  • A moving water meter dial when pipes aren’t in use.
  • Your once lush lawn is growing uneven.
  • There’s water pooling inside or outside your home.

If you suspect a slab leak or another plumbing problem within your home, please call a reputable plumbing service for slab leak detection and repair.

Our Customers Reviews

Chahib Chakrome

Summit, NJ

The service provided was great, nothing to say about the work of the plumber. 5 stars to him. But the company charges felt way too much for the work. We would have liked to have the same plumber take care of other things in the house, but every time he check how much extra the company will charge for the job, the price just got too much. The plumber did an amazing job he selected a beautiful faucet to replace our old one. He did his best. But the company prices have no room for negotiation.

Tiffany DeSande

Plainfield, NJ

A million stars!!!! Steve and Lucas were absolutely amazing. My parents pipes burst and within 4 hours of calling they came and fixed everything!!! Very nice guys and dealt with my panicking. I will always use them if needed in the future and you all should too!!! Thank god for people like this!!! Thank you so much guys!!!

Naomi Langer-Seltzer

New Brunswick, NJ

We got very quick service, I think the plumber actually arrived in less than an hour! After reviewing what was happening, he gave us our options and performed the option we selected. This happened in the late afternoon or early evening. It was already dark and there was a lot of snow on the ground.

Steve Smith

Mountainside, NJ

I needed immediate, same day service in the early evening at my home. I went to the internet and looked up plumbing services that offered "24-hour, 7-day a week" availability. The first 3 places I called said that they could not get to me until the following day. Then I called Mr. Rooter. They were courteous and promptly got a technician to my house within an hour and a half. The technician, Lucas Kaufmann, was exceptional. The job was not easy, but he figured the problem out and got me all fixed up within an hour's time. Moving forward, I…

Stephanie Brown

Cranford, NJ

Despite what was quite obviously a busy day (day after Thanksgiving at 10pm) TJ came out and did not leave until the job was done! There were several setbacks, which at the late hour might have prompted him to leave- but he chose to stay and continue until the job was complete! I only have one bathroom so I was really hoping he could make it work, and he really did a wonderful job! So thankful for all of his help! I highly recommend TJ!

Shaheen Dhanani

Union, NJ

This is my second time using Mr. Rooter and I have to say they are an excellent company of experienced professionals! The service techs were courteous, experienced and actually spent time trying to figure out the issue before proposing the solution. They were also patient and answered all my questions without rushing the work. I will be using them again.

Christie Murphy

Montgomery, NJ

TJ was amazing! 10/10 recommend this company. We were in an emergency state of panic with a burst pipe in the middle of a bad snowstorm. TJ came with knowledge, professionalism, kindness, and found the root of the problem within five minutes of being here. We will be using him again in the spring to fix an outdoor issue he found!

Alan Abraham

Clark, NJ

The technicians were friendly, professional and knowledgeable. The price was too high I believe, but the technicians had no control over that. The technicians took their time and did a great job. I would use them again and also recommend them.

Amy Swart

Berkeley Heights, NJ

Excellent service! Charles and Nicholas of Mr. Rooter arrived to my scheduled service a few minutes early, wore sanitary shoe coverings, and were extremely professional. They found the source of my leak quickly and fixed the issue. While they here, I requested an additional hydraulic heating inspection which they accommodated. They were very knowledgeable and provided helpful tips. I highly recommend this team and I will definitely call them for all future plumbing needs!!

JACKY Coppola

Wall Township, NJ

TJ came to my aid as the water pipe froze in my house. Although nothing could be done he gave me hints of what could be done my me which was very helpful. I found TJ very professional and caring about my situation. The best part of the very long night was the dogs adored him one wanted to accompany him to his next job. Thank you for employing such an amazing man. Plus today there is water running in the house. Thank you TJ and thank you Mr. Rooney plumbing for employing a man with helpful hints!!!!!

How Bad Is A Slab Leak?

Slab leaks can be very bad and can cause a lot of damage to your home. If a slab leak is not repaired early enough, it can lead to:

  • Water damage: Slab leaks can cause water damage to your floors, walls, and fuiture.
  • Mold growth: Mold can grow in areas that are damp or wet, and it can cause health problems.
  • Structural damage: Slab leaks can weaken the foundation of your home and cause it to crack or settle.
  • Expensive repairs: Slab leaks can be expensive to repair, and the cost will increase the longer the leak is left untreated.

Contact Mr. Rooter Plumbing For Slab Leak Detection And Repair

If you suspect that you have a slab leak, it is important to contact a qualified plumber for leak detection and repair. Mr. Rooter Plumbing has the experience and expertise to detect and repair slab leaks quickly and efficiently. We will use the latest technology to locate the source of the leak and repair it using the most effective methods. You can always count on the team at Mr. Rooter Plumbing for all of your plumbing needs, including leak detection, water leak repair, drain cleaning, pipe repair, preventive maintenance, and more.

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