High Water Bill on Oahu? How to Find a Hidden Leak

When your water bill jumps and your habits haven't changed, water is going somewhere. The good news: you can usually confirm a leak yourself in a few minutes, and most culprits are simple fixes.

Step 1: The meter test

Turn off every fixture and appliance that uses water — faucets, toilets, washer, dishwasher, irrigation. Find your water meter, usually in a ground box near the street, and look at the leak indicator (often a small triangle or dial). If it's moving, water is flowing. For slow leaks, write down the reading, avoid using water for an hour, and check again.

Step 2: Check the toilets

Running toilets are the most common hidden water waster. Put a few drops of food coloring in the tank and wait 15 minutes without flushing. If color shows up in the bowl, the flapper is leaking — an inexpensive fix that can stop a constant flow.

Step 3: Look and listen

Check under sinks, around the water heater, at outdoor hose bibs and along any irrigation lines. Listen for a hiss when the house is quiet. In slab-on-grade homes, a warm spot on a tile floor can point to a hot-water line leaking under the concrete.

When it's time for a pro

If the meter is moving and you can't find a visible source, the leak is likely underground, in a wall or under the slab. Professional leak detection uses acoustic and thermal tools to pinpoint it without guesswork, so the repair opening is as small as possible.

Don't wait on it

A hidden leak costs you on every bill and can damage floors, cabinets and walls in the meantime. Tell us what you're seeing through the form below and a local pro will contact you within 24 hours.