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As silverback51 mentioned, desalinization for california would be a good solution. Though still costly at this point and with very high energy consumption, a viable possibility for the future. Energy usage could be dealt with through solar or wave energy, both of which reduce the greatest challenge desalinization faces.
Something I thought of years ago, and feel free to slap me if this is too far out there, would be a pipe laid down from the northwest, probably the mouth of the Columbia River, to southern California. Submerge it off the coast so there will be no dealing with right of way property squabbles or issues with possible leaks. A pumping station at both ends should keep water flowing. Yes, this is a big undertaking, but any solution we look at will be equal if not greater.
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