(1) Water rights for the irrigation of lands are exempt from taxation.
(2)  Canals, ditches, pipelines, flumes, aqueducts, reservoirs, dams, and any other necessary facility used primarily for the conveyance, storage, or providing of water for the irrigation of lands, are exempt from taxation to the extent irrigation water is thereby conveyed, stored or diverted; provided that if any portion of such property is used for purposes other than irrigation of lands or the conveyance, storage, or providing of water to a nonprofit irrigation company or irrigation district, the assessor shall determine the entire value of such property so used and assess the proportionate part of such property that is devoted to such use.

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Terms Used In Idaho Code 63-602N

(3)  All real and personal property is exempt that is owned, used, operated or occupied:
(a)  Primarily for the maintenance and operation of any irrigation project or irrigation works or system in conducting the business of furnishing water to landowners, members or shareholders; or
(b)  By any organization, whether incorporated or unincorporated, heretofore organized or which shall hereafter be organized, for the operation, maintenance, or management of an irrigation project or irrigation works or system and for the purpose of furnishing water to landowners, members or shareholders, the control of which is actually vested in those entitled to the use of the water from such irrigation works or system for the irrigation of lands to which the water from such irrigation works or system is appurtenant, including all title and interest in such property as owner, lessee, or otherwise.
Provided, that if any portion of such property is used for commercial purposes by others than its landowners, members or shareholders, the assessor shall determine the entire value of such portion of the property so used and assess the proportionate part of the property that is used for commercial purposes.