ASR (aquifer storage and recovery) is absolutely part of the mix for water supply in the state water plan.
Availability of water isn't our issue, believe it or not. The issue is the COST of available water. People want two kinds of water: 1) lots of it, and 2) cheap. Turns out, you can only have one or the other, not both. I worked with an old water engineer who had a great way of putting it: "Shit, water is free, it falls from the sky. It's the catching it, holding it, treating it, and transporting it that costs so much damned money."
We can build more reservoirs, build very expensive transport pipelines, do expensive ASR and desalination, all that stuff. It costs lots and lots of moolah (we've discussed transport pipelines here before -- people think and ask "how much could it be?" not realizing that the answer is "a metric fuckton of dollars, that's how much" is the truth). So, we can do all the stuff Clever suggests and more. You're just gonna get a bill for it. Which you'll scream about. So, very little of it will actually ever get done.