Wash. Rev. Code § 48.30.320
Every authorized insurer, upon canceling, denying, or refusing to renew any individual life, individual disability, homeowner, dwelling fire, or private passenger automobile insurance policy, shall, upon written request, directly notify in writing the applicant or insured, as the case may be, of the reasons for the action by the insurer. Any benefits, terms, rates, or conditions of such an insurance contract which are restricted, excluded, modified, increased, or reduced because of the presence of a disability shall, upon written request, be set forth in writing and supplied to the insured. The written communications required by this section shall be phrased in simple language which is readily understandable to a person of average intelligence, education, and reading ability.
RCW 48.30.320