This us a faulty analogy. In the case of the atmosphere we all share it and it blows around all over the world. In the case of domestic water distribution systems, the water system that supplies your garden hose and the one that supplies orchards and fields are completely distinct, unconnected, and not interchangeable. If your local California water utility is running low on water there is nothing that an almond grower in Fresno County can do for you.