Once you know you have a leak, you'll need to hire a plumber. But how do plumbers find leaks? Plumbers use moisture meters and determine the area of the wall with the highest moisture levels. Sometimes, leaks are located using infrared cameras, which point out the coolest (and wettest) areas behind the walls.

Water leaks can also be detected by infrared cameras, as wet areas tend to be cooler in temperature. Again, plumbing professionals will usually provide their own camera to locate the leak. Once your plumbers find the location of the leak, they'll get to work fixing it.