Wash. Rev. Code § 6.25.040
An action may be commenced and the property of a debtor may be attached previous to the time when the debt becomes due, when nothing but time is wanting to fix an absolute indebtedness, and when the complaint and the affidavit allege, in addition to that fact, one or more of the following grounds:
[ 2011 c 336 s 148; 1987 c 442 s 804; 1886 p 39 s 3; RRS s 649. Prior: Code 1881 ss 174-192; 1877 pp 35-40; 1873 pp 43-50; 1871 pp 9, 10; 1869 pp 41-47; 1863 pp 112-120; 1860 pp 30-36; 1854 pp 155-162. Formerly RCW 7.12.030.]
Rules of court:Cf. CR 64.