Wash. Rev. Code § 87.03.645
The boundaries of any irrigation district or consolidated irrigation district, now or hereafter organized under the provisions of this chapter, may be changed, and tracts of land which were included within the boundaries of such district, or former irrigation districts which were included within the boundaries of such consolidated district, at or after its organization under the provisions of this chapter, may be excluded therefrom in the manner herein prescribed; but neither such change of the boundaries of the district or consolidated district, nor such exclusion of lands from the district, nor such exclusion of a former district from a consolidated district, shall impair or affect its organization or the rights of the district in or to property, except that all property of a consolidated district, the title to which was derived from a former district by, and at the time of, the consolidation shall revert to and become the property of such former district when reestablished as herein provided; nor shall it affect, impair or discharge any contract, obligation, lien, or charge for or upon which such district or such consolidated district was or might become liable or chargeable had such change of its boundaries not been made, or had not any such land been excluded from such district, or any such former district been excluded from such consolidated district, unless the holders of such lien, obligation, charge or contract right chargeable against the district, or consolidated district consent to such exclusion in the manner hereinafter provided in RCW 87.03.670 for the consent of the bondholders.
RCW 87.03.645