I am not addressing convenience, only lack of space. There is plenty of space in Cali and the Southwest. Desalinization could make a lot of the land useful for homes and businesses.
Someone please tell idiot Gov Newsom. He wants to spend billions to build a water tunnel to send water from Northern California to L.A. in the south. Even though an aqueduct already serves that purpose, stealing water from the north for L.A. swimming pools.