Public Breastfeeding Law
“(1) A person is guilty of indecent exposure if he or she intentionally makes any open and obscene exposure of his or her person or the person of another knowing that such conduct is likely to cause reasonable affront or alarm. The act of breastfeeding or expressing breast milk is not indecent exposure.”
Freedom from discrimination — Declaration of civil rights. “(1) The right to be free from discrimination because of race, creed, color, national origin, sex, honorably discharged veteran or military status, sexual orientation, or the presence of any sensory, mental, or physical disability or the use of a trained dog guide or service animal by a person with a disability is recognized as and declared to be a civil right. This right shall include, but not be limited to:
…(g) The right of a mother to breastfeed her child in any place of public resort, accommodation, assemblage, or amusement.”
Wash. Rev. Code § 49.60.215 “RCW 49.60.215
"Unfair practices of places of public resort, accommodation, assemblage, amusement — Trained dog guides and service animals.
(1) It shall be an unfair practice for any person or the person's agent or employee to commit an act which directly or indirectly results in any distinction, restriction, or discrimination, or the requiring of any person to pay a larger sum than the uniform rates charged other persons, or the refusing or withholding from any person the admission, patronage, custom, presence, frequenting, dwelling, staying, or lodging in any place of public resort, accommodation, assemblage, or amusement, except for conditions and limitations established by law and applicable to all persons, regardless of race, creed, color, national origin, sexual orientation, sex, honorably discharged veteran or military status, status as a mother breastfeeding her child, the presence of any sensory, mental, or physical disability, or the use of a trained dog guide or service animal by a person with a disability: PROVIDED, That this section shall not be construed to require structural changes, modifications, or additions to make any place accessible to a person with a disability except as otherwise required by law: PROVIDED, That behavior or actions constituting a risk to property or other persons can be grounds for refusal and shall not constitute an unfair practice. (2009 Wash. Laws, Chap. 164, HB 1596)"
Work Place Pumping Law
None at a state level.