Finding & Repairing Underground Water Leaks | RF Plumbing & Air · Rainforest Plumbing and Air

Underground & Foundation Slab Leaks

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Underground & Foundation Slab Leaks


What causes an underground slab leak?

An underground leak isn’t readily apparent, but leaking pipes located under the ground are more likely to occur than one would think. Despite what we tend to think, the ground is a pretty unstable place. Settling frequently occurs due to the weight of overlying structures. Saturation can take place, causing the ground to “sag” with increased water weight. Tree roots also intrude into pipelines, causing clogs. Also, expansion and contraction occur with fluctuations in temperature.

Your pipes are in the middle of all of these variables, so it’s no wonder that they sometimes will break under the strain. When this happens, Rainforest Plumbing & Air technicians first locate the point of breakage, then carefully and safely excavate. Of course, temporary water shutoff will be necessary, but we’ll have you up and running again in no time. 


How to find an underground or slab water leak?

If water is seeping or “pooling” near the foundation of your home or anywhere on your property, you could have a broken or cracked pipe underground. If the leak is coming up through floors or pavement, we can find and fix that too!

The first thing to do if you suspect a water leak is to pay attention to the signs and look for any damage. You can test things by turning off your water, faucets and water appliances. Then, check the water meter for any activity. If there is activity, you most likely have a leak somewhere. This is when you should investigate further or call us at Rainforest Plumbing and Air.

There are a few signs that will alert you to a water leak under your slab.

  • An unexplained spike in your water bill
  • Pools of water where there shouldn’t be, like water protruding from the slab
  • The smell or visibility of mold or mildew
  • Decrease water pressure
  • Consistently running hot water heater
  • Areas of the floor are always hot
  • Foundation is cracking

How to fix a slab leak underground?

To fix an underground or slab leak, the tricky part is going to be locating the leak and gaining access to it.

The first step is to locate the leak. Then, you will need to chisel through the concrete to repair it by breaking through with a jackhammer. This will help you gain access to the leak.

Repair the copper pipe that is damaged by cutting the damaged sections with a hacksaw. Once this is done, replace it with new tubing.

If you have a leaking sewer line, it is best to call us to deal with the situation, mainly due to the complex pipes used and the health-related issues being exposed to human waste. We take the proper safety precautions and know how to get the job done right and safely.


How much does an underground leak cost?

The cost of an underground leak is going to be based on the severity of the leak and the location of the leak. This is why it is best to always try to catch it as soon as possible to prevent even more costly damage. The cost to detect a leak will run between $150 to $400. You could be looking at a total of around $2,000 for a complete leak repair.


At Rainforest Plumbing and Air, we offer the Upfront Guarantee. We always provide you with an accurate estimate before we begin the job. If there are any changes in price as we get going, we will always alert you to the changes.


Rainforest Plumbing and Air has been serving the greater Phoenix area for over 20 years, offering timely, accurate, and fair service. From preventative maintenance to reactive maintenance, the team at Rainforest is just a phone call or click away.


We are open 24 hours a day, 7 days a week, so we are always here when you need us for all of your plumbing and HVAC needs.


If you are experiencing a leak under your slab, or think you may have one, give us a call today at 602-253-9376 or click here to schedule an appointment.