7 Signs of a Slab Leak in Your Oahu Home

Slab-on-grade construction is common across Oahu, especially in newer neighborhoods. It's durable and practical, but it means water lines can run beneath the concrete where you can't see a leak. Catching one early saves water, money and flooring.

The warning signs

1. A rising water bill with no change in how you use water. 2. The sound of running water when every fixture is off. 3. Warm spots on tile or concrete floors, which point to a hot-water line. 4. Damp carpet or warped flooring with no obvious source. 5. Cracks in flooring or tile that appear suddenly. 6. Lower water pressure throughout the house. 7. A water heater that runs constantly because hot water is escaping.

Why slab leaks happen

Pipes under a slab can wear where they rub against concrete or gravel, corrode over time, or fail at joints as the ground shifts slightly. Older copper lines are especially prone to pinhole leaks.

How pros find them

A plumber first confirms the leak at the meter, then isolates hot versus cold lines. Acoustic listening equipment and thermal imaging pinpoint the location so any opening in the floor is small and precise.

Repair or reroute?

A single leak can often be repaired through a small opening. If the line has failed more than once, rerouting it through walls or the attic usually costs less over time and keeps your floors intact.

Seeing the signs?

Don't wait for the next bill. Describe what you're noticing in the form below and a local leak detection pro will contact you within 24 hours.