What do you when you have faucet leak water?

It depends on the type of leak. Some can easily be repaired by replacing a washer or other part. It may also be necessary to replace the whole fitting. Many hardware shops will sell faucet kits which have complete instructions on installation. It is important to ensure that the water to the sink or bath is cut off before making a repair. If a person is uncomfortable making a repair, a plumber may be called.