Most of the water goes into farming at super cheap rates to feed the rest of the country almonds and other crap. It's not that difficult to get enough water to people for supporting residents, just price water at a market rate like anything else.
Earthquakes, fires and mudslides but it's ok because "surf and ski in the same day bro".
Something something glass houses, stones, pots and kettles...
A $5-$6 billion crop, consuming half the residential water for a $2.7 trillion economy. If you include alfalfa, which is even worse than almonds, it's something comparable to 150% of all the residential water use in California.
It's a spectacular failure on the part of the state of California. Where are the famous CA voter propositions when you need them? A large share of the alfalfa and almonds - aka California's water - gets exported to Asia. It's social and economic suicide for meager benefits.