Not every leak drips where you can see it. Hidden leaks inside walls, under slabs, or in buried supply lines can run for weeks, driving up your bill and quietly damaging your home before anyone notices.
Signs of a hidden leak
Keep an eye out for:
- A water bill that jumped with no change in usage
- The sound of running water when everything is turned off
- Warm spots on the floor, which can indicate a slab leak
- Damp patches, stains, or bubbling paint on walls or ceilings
- A musty smell or unexplained mold
- Lower water pressure than usual
The water meter test
Here is a simple check you can do yourself. Turn off every water fixture and appliance in the home. Find your water meter and note the reading or the position of the leak indicator. Wait about one to two hours without using any water, then check again. If the meter moved, water is escaping somewhere, which points to a leak.
What to do next
Finding the exact location of a hidden leak takes specialized tools. A plumber can use acoustic listening and pressure testing to pinpoint the leak without opening up the whole house, then repair it. Catching it early keeps both the water bill and the repair smaller.
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