The law applies to businesses with 50 or more employees, who are not eligible for exemption due to placing undue hardship on the operation of the business. Here's more information on the law that provides nursing mothers with break time at work.
Break Time for Nursing Mothers
A nursing mother is allowed the time to express breast milk each time she feels the need, as the Affordable Care Act recognizes the importance for her to maintain her milk supply while she is at work. Any paid break time can be used for the purpose of expressing breast milk, and additional time may be taken without compensation or penalty. If the State laws provide additional benefits, they will be the standard for compliance of the employer.
Employer Accomodations for Nursing at Work
Employers must 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." http://www.dol.gov/whd/regs/compliance/whdfs73.htm The place can be a temporary or permanent space, as long as it offers the appropriate privacy, and as long as there is enough room to privately accommodate all of the women who need it without extended waiting periods.
