Wash. Rev. Code § 87.03.650
The owner or owners in fee of one or more tracts of land which constitute a portion of an irrigation district, or fifty or a majority of the holders of title to lands constituting any portion of an irrigation district, or consolidated district as the case may be, for which lands similar grounds for exclusion may exist, or fifty or a majority of the holders of title to lands which constituted a former irrigation district included with a consolidated district, may file with the board of directors of such district, or of such consolidated district, as the case may be, a petition praying that such tracts, and any other tracts contiguous thereto, or such land which constituted such former district, may be excluded and taken from said district, or consolidated district, as the case may be, and in the latter case that such former district may be reestablished. The petition for the exclusion of tracts of land from a district shall describe the boundaries of the land which the petitioners desire to have excluded from the district, and also describe the land of such of said petitioners which are included within such boundaries; but the description of such lands need not be more particular or certain than is required when the lands are entered in the assessment book by the county assessor. The petition for the exclusion of a former district from a consolidated district shall give the corporate name and number of such former district and shall describe the lands of each of said petitioners by legal subdivision or lot and block numbers and name of city, town or addition of platted lands. Every such petition must be acknowledged in the same manner and form as is required in case of a conveyance of land, and the acknowledgment shall have the same force and effect as evidence as the acknowledgment of such conveyance.
RCW 87.03.650
Acknowledgments: Chapter 64.08 RCW.
Property taxes-Listing of property: Chapter 84.40 RCW.