Wash. Rev. Code § 1.80.070
(2) If a law other than this chapter requires a record (a) to be posted or displayed in a certain manner, (b) to be sent, communicated, or transmitted by a specified method, or (c) to contain information that is formatted in a certain manner, the following rules apply:
(4) The requirements of this section may not be varied by agreement, but:
[ 2020 c 57 s 8.]