Wash. Rev. Code § 85.22.050
The commissioners of the old district shall become the supervisors of the reorganized district and shall have all the rights and powers and be subject to all laws applicable to a diking or drainage improvement district. The supervisors shall also have the power of using such drainage ditches and equipment in the district for irrigation purposes at proper times and may adapt such ditches to such purposes by making the necessary improvements therein. The supervisors shall also have the right to purchase and install machinery, pumps and other equipment for the carrying on of such irrigation within the district. Notwithstanding such dissolution and reorganization, none of the outstanding bonds, warrants or other indebtedness of the district, shall be affected thereby; and all lands liable to be assessed to pay any of such bonds, warrants or other indebtedness shall remain liable to the same extent as if such reorganization had not been made, and any and all assessments theretofore levied or made against any such lands shall be and remain unimpaired and shall be collected in the same manner as if no such reorganization had been had. The legislative authority of the county in which such reorganized district is situated shall have all the powers possessed at the time of the reorganization by the board of commissioners of such district to levy, assess, and cause to be collected any and all assessments or charges against any of the lands within such district that may be necessary or required to provide funds for the payment of all the bonds, warrants and other indebtedness thereof.
RCW 85.22.050