Wisconsin State Statute 253.165 Right to Breast-feed
A mother may breast-feed her child in any public or private location where the mother and child are otherwise authorized to be. In such a location, no person may prohibit a mother from breast-feeding her child, direct a mother to move to a different location to breast-feed her child, direct a mother to cover her child or breast while breast-feeding, or otherwise restrict a mother from breast-feeding her child as provided in this section.
Dane County, Wisconsin Ordinance 34.015 Interfering with breastfeeding prohibited
No person shall interfere with a mother breastfeeding her child or expressing breast milk within any public accommodation where the mother would otherwise be authorized to be.
City of Madison, WI Ordinance 23.37 Interfering with breastfeeding prohibited
Notwithstanding any other provision of law, a mother or her surrogate may breastfeed her child and may express breastmilk in any location, public or private, except the private home or residence of another, where the mother or her surrogate and the child are otherwise authorized to be present. Any person who intentionally interferes with a mother’s or her surrogate’s attempts to breastfeed her child or to express breastmilk, except the owner or resident of a private home or residence, shall be subject to a forfeiture of not less than $25.00 nor more than $250.00 for each such violation.
USBC maintains a web page of existing legislation, including federal laws related to breastfeeding and lactation and links to sources for state-level legislative information.
More details on federal legislation supporting lactation in the workplace can be found here.