Idaho Code § 42-912

Any person, company or corporation owning or controlling any canal or irrigation works for the distribution of water under a sale or rental thereof, shall furnish water to any person or persons owning or controlling any land under such canal or irrigation works for the purpose of irrigating such land or for domestic purposes, upon a proper demand being made and reasonable security being given for the payment thereof: provided, that no person, company or corporation shall contract to deliver more water than such person, company or corporation has a title to, by reason of having complied with the laws in regard to the appropriation of the public waters of this state.