You are clueless.

Simply google desalination plants and you will see just how incredibly expensive it is. The $1 billion desalination plant near San Diego supplies around 110,000 people.
The population of CA as of 2010 was over
37 million so just how much do you think it would cost to supply the entire population, not to mention the need for agricultural water.
no . not clueless. just willing to entertain an idea that could help instead of just whine about a water shortage.
I actually did google it and that site claimed it cost about 1-2 dollars per gallon of water to desalinate , compared to 20-30 cents per gallon , for water coming out of aquifer
1st. you do not need to supply enough for 37 million. you need only supply enough to take up the slack so aquifers can recharge.
2. no one is suggesting that is the only answer, just one of many.if more dams will help then build them also.
3.as with most manufactured goods the more you do it the less expensive it gets.not to mention advances in technology that can make something fiscally not worth doing , profitable eventually. is that not the california greenies stance on green energy??? lol.
4. I get that it is expensive. but let me ask you this , is the problem going to magically go away???is it going to get cheaper by waiting with hands tied and doing nothing? what has a higher cost, desalination plants, or just sitting back crying the sky is falling till it falls?
5.if the land the population is living on cannot sustain the population. perhaps that population should consider moving to a place that will.
6.seems to me it will come down to a simple choice in the future. choose to pay more and live, move away or just die.
I can say with complete honesty that I do not much care which choice is made since I don't live there and care nothing about those who do. but if I did, I would choose to survive no matter the cost. I would think most others would also.