What do you call that thing that you wash your hands in?

A good employee who cares about not spreading his or her germs should wash their hands in the back if the employee is working at a restaurant, or if the employee is working at lets say a business like 7eleven or a big business, the 7eleven employee would have no choice but to wash his or her hands in the bathroom that is open to the public, same goes for the business man, unless there is a sink in the employee lounge,which there usually is.