Wash. Rev. Code § 87.03.500
In the event of the failure of the lands within the local improvement district to furnish money sufficient for the payment of principal or interest of the bonds or the contract as provided for in RCW 87.03.485 for such local improvement work and there shall be a default in the payment of principal or interest as aforesaid, the amount delinquent shall be paid by the general warrants of the irrigation district at large or, in the event of a contract, by whatever means of payment is called for thereunder, but the lands of the local improvement district shall not thereby become released from liability for special assessment therefor. Such warrants, if issued, shall be redeemed as soon as there shall be available money in the bond redemption fund of the local improvement district.
RCW 87.03.500