RCW 48.88.040: Association—Membership.

The association shall be comprised of all insurers possessing a certificate of authority to write and engage in writing property and casualty insurance within this state on a direct basis, including the liability portion of multiperil policies, but not of ocean marine insurance. Every such insurer shall be a member of the association and shall remain a member as a condition of its authority to continue to transact business in this state.