California Code, Water Code - WAT § 10521

(a) “Water conservation” means the reduction of the amount of water consumed or irretrievably lost in the process of satisfying beneficial uses which can be achieved either by improving the technology or the method for diverting, transporting, applying, reusing, salvaging, or recovering water, or by implementing other conservation methods.

(b) “Efficient water management” means reasonable and economically justifiable programs to improve the delivery and use of water for agricultural purposes that will result in water conservation.

(c) “Water supplier” means the department or other public agency that supplies water for agricultural use.