Idaho Code § 43-332
Whenever a parcel of land lying within an irrigation district is subdivided and plats of such subdivision are filed as provided by law, and the owners fail to properly apportion the water to their various tracts in the subdivision, or upon request made by fifty percent (50%) or more of the owners of the tracts in the subdivision the board of directors may employ some competent person to distribute and apportion water for such tracts. The reasonable cost of such services shall be apportioned each year by the board to such tracts. The cost of such services shall be assessed by the board as a special charge to the tracts in the same manner as other assessments are made by the board. The assessment so levied and apportioned shall be a lien upon the tracts, and shall be collected in the same manner as all other assessments are levied and collected by the board.
Idaho Code § 43-332