Your legal rights when it comes to pumping breastmilk when you return to work really depends on the state in which you work and the company for which you work. The reason for that is because only about half of the states have laws on the books that protect a woman's right to take time away from her day to pump milk. Those laws, essentially, provide for women to reasonable break times in a clean environment, that is not the bathroom, in order to take care of this need. If you don't work in one of those states, there is also a recently enacted Federal law that provides a similar right to everyone in the country. However, that only applies to certain large companies. Companies that employ at least 50 employees. What I recommended to any mother who knows that she has to go back to work and knows that she will need to pump at work is to touch base with Human Resources in advance, before returning to work, to find out what arrangements can be made to make this an easy process when she gets back to the office.