Wash. Rev. Code § 70A.500.170
No person may sell or offer for sale a covered electronic product to any person in this state unless the manufacturer of the covered electronic product has filed a registration with the department under RCW 70A.500.040 and is participating in an approved plan under RCW 70A.500.050. A person that sells or offers for sale a covered electronic product in the state shall consult the department's website for lists of manufacturers with registrations and approved plans prior to selling a covered electronic product in the state. A person is considered to have complied with this section if on the date the product was ordered from the manufacturer or its agent, the manufacturer was listed as having registered and having an approved plan on the department's website.
RCW 70A.500.170