How do I know if I have a hidden water leak?
Common signs are a water bill that jumps with no change in use, damp or stained walls and ceilings, warped floors, a musty smell, and the sound of running water when nothing is on. Your water meter can confirm it.
To check the meter, turn off every tap and water-using appliance, note the reading, and wait an hour without using water. If the reading has moved, water is going somewhere.
How do plumbers find hidden leaks?
Plumbers use tools such as acoustic listening devices, moisture meters, thermal cameras and pressure tests to narrow a leak down before opening anything up. The aim is to cut one small hole in the right place, not several in the wrong ones.
For leaks under a concrete slab, or in the line between the meter and the house, ask whether the contractor does slab or service-line leak location.
How much does it cost to fix a leaking water line?
HomeServe’s Tennessee water service line figures put the average diagnosis at $195, the average repair at $830 and the average replacement at $2,716. HomeServe notes prices may have risen up to 17% since 2020.
Leaks inside walls or floors are priced by the repair plus any opening and patching. Ask whether drywall or flooring repair is included or separate.
Who fixes a leak between the meter and the house?
In most cases the property owner is responsible for the line from the meter to the house, and the water utility for the meter and the line to the street. Your utility can confirm where the boundary is.
If water is pooling near the meter itself, call your water utility first.
Frequently asked questions
Can a small leak really cause much damage?
Yes. A slow leak inside a wall or under a floor can rot wood and grow mold for months before it shows.
Should I turn off my water if I suspect a leak?
If water is visibly spreading, yes. Shut off the main valve and call 865-321-8269.
Updated 2026-10-07