Wash. Rev. Code § 5.50.050
An unsworn declaration under this chapter must be in substantially the following form: I declare under penalty of perjury under the law of Washington that the foregoing is true and correct. Signed on the . . . . day of . . . . . ., . . . .,
[ 2019 c 232 s 3; 2011 c 22 s 6.]