Wash. Rev. Code § 7.77.040
(3) A collaborative law process is concluded by a:
(4) A collaborative law process terminates:
(b) When a party:
(ii) In a pending proceeding related to the matter:
(7) Notwithstanding the discharge or withdrawal of a collaborative lawyer, a collaborative law process continues, if not later than thirty days after the date that the notice of the discharge or withdrawal of a collaborative lawyer required by subsection (5) of this section is sent to the parties:
(b) In a signed record:
[ 2013 c 119 s 5.]