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Slab Leak Detection and Repair Across Hawaii

Fast, reliable service, done right the first time.

We find and repair leaks in water lines under concrete slabs on Oahu, Maui and the Big Island, with upfront pricing before any work starts.

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A slab leak is a break in a water line that runs through or under the concrete slab your home sits on. Because the pipe is buried, the leak can run for weeks before anyone notices, soaking the soil, raising the water bill and pushing moisture up into floors and walls. All Aloha Plumbing finds and repairs slab leaks for homes and businesses on Oahu, Maui and the Big Island. We are a family-owned, licensed and insured Hawaii contractor, license CT-36812.

Why Pipes Under a Slab Fail

Most slab leaks start with slow damage that builds over years. The causes we run into most often include:

  • Aging pipe. Older copper and galvanized lines thin out from the inside until a pinhole opens.
  • Abrasion. A pipe that rubs against rebar, gravel or another line wears through as the house expands, contracts and vibrates.
  • Soil movement. Settling, heavy rain and ground shifts put stress on rigid pipe locked in concrete.
  • High water pressure. Pressure above what the system was built for strains joints and weak spots.
  • Harsh chemicals. Repeated use of chemical drain cleaners can eat away at metal pipe walls.
  • Poor original installation. Kinked, poorly supported or badly joined pipe can fail early.

Warning Signs to Watch For

A small slab leak may show no clear sign for a long time. When symptoms do appear, they tend to look like this:

  • A water bill that climbs with no change in how you use water
  • A warm or hot patch on tile or concrete, which often points to a hot water line
  • Damp carpet, loose floor tile or swelling baseboards
  • New cracks in floors or lower walls
  • A musty smell or mold near the floor line
  • Water running or hissing when every fixture is off
  • Pooling water or soggy ground along the foundation
  • Lower pressure at faucets and showers

If you notice more than one of these, shut off the main water valve if you can and have the line checked before the damage spreads.

How We Find and Fix the Leak

We start by confirming there is a leak, usually by shutting off fixtures and watching the meter and pressure. Then we narrow down the location with leak detection equipment so we open as little concrete as possible. Once we know where the break is, we walk you through the repair options and give you upfront pricing for approval:

  • Spot repair. We open the slab at the leak, repair the damaged section and patch the concrete.
  • Reroute. We abandon the failed line under the slab and run new pipe through the walls or attic.
  • Repipe. When the pipe has several weak spots, replacing the system can make more sense than chasing one leak after another.

Some repairs may require a permit, and we will tell you if yours does. Financing is available, and we offer senior and military discounts plus $50 off any plumbing service.

Slab Leak Service on Each Island

The repair methods are the same everywhere, but local conditions change what we look for.

  • Oahu. Many older homes in areas like Pearl City, Aiea and Kailua still have original metal pipe in the slab, and windward neighborhoods get heavy rain that keeps the soil wet. Our Oahu team works out of Waipahu. Read more about slab leak repair on Oahu.
  • Maui. From Kahului and Wailuku to Kihei and Lahaina, we work on both homes and vacation rentals, where a leak can go unnoticed between guests. Our Maui team is based in Makawao. Read more about slab leak repair on Maui.
  • Big Island. We cover Kailua-Kona, Hilo, Waimea, Waikoloa and Pahoa. The island is large, so arrival windows depend on where you are. Read more about slab leak repair on the Big Island.

Get a Slab Leak Checked

A slab leak does not fix itself, and the longer it runs the more it costs to repair. Choose your island page above to learn more or book a visit. If a leak is causing damage right now, call the number at the top of this page. A real plumber answers 24/7.

Need Slab Leaks on Hawaii?

A real plumber answers 24/7. Average island response: under 30 minutes.

Call (808) 466-0000

Need Help Now?

Plumbers on call 24/7 across Oahu, Maui,
and the Big Island.

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Our Services

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Quick Answers

Good To Know

Do you repair slab leaks on all three islands?

Yes. All Aloha Plumbing handles slab leak detection and repair on Oahu, Maui and the Big Island. Our Oahu team works from Waipahu and our Maui team from Makawao. On the Big Island we serve towns such as Kailua-Kona, Hilo and Waimea as a service area. Because the Big Island covers so much ground, arrival windows there vary by location.

How can I tell if I have a slab leak?

The most common clue is a water bill that rises with no change in use. Other signs include a warm spot on the floor, damp flooring, new cracks, a musty smell or the sound of running water with every fixture off. You can also turn off all fixtures and watch the water meter. If it keeps moving, water is escaping somewhere.

What should I do first if I suspect a slab leak?

Shut off the main water valve to stop water from flowing into the slab, then call a licensed plumber. Move rugs and belongings away from wet areas and dry what you can to slow mold growth. Avoid breaking up flooring yourself. A plumber can locate the leak first so only the needed section of concrete is opened.

Is it better to repair the slab or reroute the pipe?

It depends on the pipe and where the leak is. A single leak in otherwise sound pipe is often fixed with a spot repair through the slab. If the line is old or has already failed more than once, rerouting new pipe through the walls or attic can prevent future digging. We explain each option and give upfront pricing before work starts.

Real Customers • Real Stories

What Our Ohana Says

5 star rating quote

“All Aloha came out super fast and fixed our leak the same day. Excellent service! These guys are real pros and treated my home with respect.”

HBM

Hawaii Bottle Man

Honolulu, Oahu

5 star rating quote

“They replaced our water heater quickly and left everything spotless. The crew showed up exactly when they said they would. Couldn’t ask for better.”

RC

Ray Cabanting

Kailua, Oahu

5 star rating quote

“Called at midnight with a burst pipe. They were here in 25 minutes and had it contained before the ceiling came down.”

TT

Thai Tran

Kapolei, Oahu

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Proudly Serving

Three Islands. One Family.

From the North Shore to Hilo, we’re proud to bring honest plumbing with aloha to homes across Hawaii.

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Maui

Maui

Kahului • Lahaina • Kihei • Wailuku

Oahu

Oahu

Honolulu • North Shore • Kailua

Big Island

Big Island

Kailua-Kona • Hilo • Waimea

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