Cal. WAT § 31048

A district may cooperate, act in conjunction and contract with the State of California or any agency thereof, municipalities, public and private corporations of any kind, and persons with respect to the salvage, control, storage, spreading, distribution, treatment, purification, and recapture of any waters, including sewage and storm waters, and the construction of any works, the acquisition of any property, or the doing of any act with respect thereto, or for the protection of property, watersheds, water courses, and underground water supplies, and for the use, operation, management, or control of any public works or property.