Wash. Rev. Code § 85.08.460
Any judgment that heretofore has been obtained or that hereafter may be obtained against a county on account of any contract lawfully made by its officials for or on behalf of any drainage, diking, or sewerage improvement district, or on account of the construction or maintenance of any drainage, diking, or sewerage system of a drainage, diking, or sewerage improvement district shall be collected and reimbursed to the county from said improvement district, and the amount of such judgment shall be included in the construction costs of said district: PROVIDED, That if such judgment be recovered after the assessment to pay the construction costs shall have been levied, then the county commissioners are hereby empowered and they shall make a supplemental levy upon the lands of the district, and from the funds collected under such levy said reimbursements shall be made.
RCW 85.08.460