RCW 90.16.100: Appropriation of lands by corporations conveying water.

All corporations, authorized to do business in the state, and who have been, or may hereafter be organized, for the purpose of erecting and maintaining flumes and aqueducts to convey water for consumption or for mining, irrigation, milling or other industrial purposes, shall have the same right to appropriate lands for necessary corporate purposes, and under the same regulations and instructions as are provided for other corporations; and such corporations organized for such purposes, in order to carry out the object of their incorporation, are authorized to take and use any water not otherwise legally appropriated.