Mont. Code § 85-7-1802
Whenever lands have been included within the boundaries of an established and organized irrigation district, which from their location or conformation cannot be successfully irrigated by the irrigation works or system already constructed or proposed to be constructed or the cost of irrigating the same will become burdensome upon the landowners of the district, a majority in number of the holders of title or evidence of title to the land included in such district (such holders of title or evidence of title also representing a majority in acreage of said lands) may petition the district court of the county in which the lands of the district or the greater portion thereof are situated for an order or decree changing the boundaries of the district by the elimination therefrom of such lands.
§ 85-7-1802, MCA