In January of this year Rep Eleanor Holmes Norton for DC introduced the H.R. 866 bill (Fairness for Breastfeeding Mothers Act).
This bill requires that certain public buildings that are open to the public and contain a public restroom provide a lactation room, other than a bathroom, that is hygienic and is available for use by members of the public to express milk. The lactation room must be shielded from public view, be free from intrusion, and contain a chair, a working surface, and (if the building is supplied with electricity) an electrical outlet.
https://www.congress.gov/bill/116th-congress/house-bill/866?r=1&s=3