When it comes to plumbing issues, slab leaks are among the most serious problems a homeowner can face. These hidden leaks occur in the water lines running underneath your home’s concrete foundation (the “slab”), and while they might start off small, they can escalate quickly—leading to costly repairs, structural damage, and even serious health risks.

In this blog, we’ll break down exactly why slab leaks are dangerous, how to spot the signs early, and what steps you should take if you suspect one.

A slab leak happens when a pipe beneath your concrete foundation becomes cracked or corroded, causing water to leak into the ground under your home. Since these pipes are hidden, slab leaks can go undetected for weeks or even months, slowly eroding the foundation and surrounding materials.

1. Foundation Damage

When water leaks under your home’s foundation, it can shift the soil beneath it, leading to cracking, sinking, or even structural instability. Left unchecked, this can compromise the entire integrity of your home and lead to thousands in repairs.

2. Mold and Mildew Growth

Moisture from a slab leak creates the perfect environment for mold and mildew to grow. These fungi can spread quickly and pose serious health risks, especially to those with allergies, asthma, or weakened immune systems.

3. High Water Bills

Even a small slab leak can waste hundreds of gallons of water each month, dramatically increasing your water bill. If your usage hasn’t changed but your bill has skyrocketed, a hidden leak could be the cause.

4. Flooring Damage

Water from slab leaks often rises up through the floor, damaging hardwood, laminate, carpet, and even tile. You may notice warped floorboards, damp spots, or bubbling under the surface.

5. Electrical Hazards

In more serious cases, slab leaks can come into contact with your home’s electrical wiring or outlets. This not only increases the risk of electrical shorts or fire but can also make areas of your home unsafe to inhabit.

Slab leaks can be sneaky, but there are a few red flags to watch out for:

• Unexplained spikes in your water bill

• Warm or wet spots on the floor

• Low water pressure

• The sound of running water when all faucets are off

• Cracks in your walls or flooring

• Moldy or musty smells

If you notice any of these signs, it’s crucial to act fast before the damage becomes worse.

There are several common causes:

• Corrosion: Over time, pipes—especially older ones—can corrode due to chemical reactions with soil.

• Poor Installation: Faulty plumbing work can leave pipes vulnerable to leaks.

• Abrasion: Pipes that rub against concrete or gravel can wear down over time.

• Soil Shifts: Natural settling or earthquakes can shift the ground, cracking pipes beneath the foundation.