Idaho Code § 50-323

Cities are hereby empowered to establish, create, develop, maintain and operate domestic water systems; provide for domestic water from wells, streams, water sheds or any other source; provide for storage, treatment and transmission of the same to the inhabitants of the city; and to do all things necessary to protect the source of water from contamination. The term “domestic water systems” and “domestic water” includes by way of example but not by way of limitation, a public water system providing water at any temperature for space heating or cooling, culinary, sanitary, recreational or therapeutic uses.