Many leaks can easily be repaired by simply replacing the faucet washer. Occasionally, the valve stem packing is leaking and may also need to be replaced. Some faucets in older homes will continue to leak even after the faucet washer and packing has been replaced. This is most likely because the valve seat that the washer presses against has become worn and pitted. In some cases, the valve seat should be replaced.
Many modern fixtures are more difficult to repair than older standard designs.
For complex tasks, it is best to consult a household plumbing repair manual or hire a plumber to make the repairs. When filling the bathtub, do not let the water run down the drain until it gets hot. Close the drain immediately and adjust the temperature as the tub is filling. When shampooing, turn off water while lathering. Rinse razors in a filled sink, rather than under a running faucet.