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Leaks | 5 min read

How to Find a Hidden Water Leak in Your Home

Turn off all water, then watch your water meter. If it keeps moving, you may have a leak. Also test your toilet with food coloring.

By The Plumbing Co Team | Updated November 1, 2026
How to Find a Hidden Water Leak in Your Home
Quick answer: Turn off all water, then watch your water meter. If it keeps moving, you may have a leak. Also test your toilet with food coloring.

A hidden leak can raise your bill and harm your home before you see it. Use these simple tests.

Signs of a hidden leak - A sudden jump in your water bill - Damp spots or stains on walls and ceilings - Musty smells or mold - The sound of running water when nothing is on

Test 1: The meter check Turn off all taps and appliances. Look at your water meter. If the dial or small triangle moves, water is flowing somewhere.

Test 2: The toilet dye test Put a few drops of food coloring in the toilet tank. Wait 15 minutes without flushing. If color shows in the bowl, the flapper leaks.

Test 3: Check under sinks Feel the pipes and the cabinet floor for moisture.

What to do next If you find a leak, close the valve to that fixture. If the meter still moves, call us. We use acoustic listening tools and thermal cameras for leak detection, so we can find the spot with a small opening. Leaks under floors may be a slab leak. For a broken pipe, see pipe repair.

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Common Questions: How to Find a Hidden Water Leak in Your Home

How much water can a leak waste?

Even a small leak can waste a lot over a month. It shows up in your bill.

How do I read my water meter?

Look at the dial or the small triangle. If it moves with all water off, there is a leak.

Can a leak be inside a wall?

Yes. Damp spots, stains or sounds of running water can point to it.

Will you cut my wall?

Only a small spot, and only where tools point to the leak.

Does insurance cover leaks?

Some plans cover sudden leaks. Check your policy.

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