Water everywhere, but not on land

Rainmakers and thought leaders abound with ideas and suggestions to deal with the current California drought, but not a one of them can make rain magically appear. Instead, all that we read, for the most part, has to do with what caused the problem (too much population in an historical and perpetual arid land). Just to the left of the West Coast is an abundant supply of water, but the resolve to tap into that source with the technology we already have at our disposal is decades away and some say this will never happen.  Is that true?