In March of 2010, section 7 of the Fair Labor Standards Act (FLSA) was amended to require employers to provide accommodations in support of nursing mothers.
Federal Law requires employers to provide reasonable break time for an employee to express breast milk for her nursing child for one year after the child's birth each time such employee has need to express the milk. Employers are also required to provide a place, other than a bathroom, that is shielded from view and free from intrusion from coworkers and the public, which may be used by an employee to express breast milk.
For more information on the law, visit: US Department of Labor, Breaktime for Nursing Mothers – Overview, News, Guidance