RCW 35.39.030: Excess or inactive funds—Investment.

Every city and town may invest any portion of the moneys in its inactive funds or in other funds in excess of current needs in: (1) United States bonds; (2) United States certificates of indebtedness; (3) Bonds or warrants of this state; (4) General obligation or utility revenue bonds or warrants of its own or of any other city or town in the state; (5) Its own bonds or warrants of a local improvement district which are within the protection of the local improvement guaranty fund law; and (6) In any other investments authorized by law for any other taxing districts.