If your pipes are leaking in a ceiling or a wall, it's really difficult to know that you have a leak in the first place. There's one sure way to find out if you have a leak in your home, though it will take a bit more work to locate that leak and repair it. \
Shut off the main water valve to your home. This is usually somewhere outside the home but may be under a kitchen sink or in a utility room. \
If the main shut-off is turned off, it is impossible for any fixture, faucet, or appliance in your home to use water. So now, go look at your water meter. \
If the water meter is moving at all, and that means even the tiniest little bit, you absolutely have a water leak, and there's no question about it. Now that you know, the real work of locating and fixing that leak can begin. \
It’s best to consult with a plumber when you have a leak. The ceiling will need to be cut so the pipes can be accessed, so this will need to be repaired with new drywall after the leak has been fixed. \