Plumbing makes noises, and those noises are actually telling you something about your plumbing system. Normally, certain sounds lead to certain things. When a faucet is turned off and a loud bang follows in the plumbing behind the wall, that has a name, it’s called water hammer. What Causes Water Hammer When a faucet is on and running, water is moving in that direction at quite a rate of speed. When the faucet is turned…