I don’t mind inflicting myself on other people for eternity. I think they’ll regret it inside a decade

Minor quibble: many reservoirs in California aren’t reliant on seasonal rainfall so much as consistent snowmelt throughout the summer. Since our summers have been hotter, and hotter in the mountains, the snow we actually get (which is less than we used to) doesn’t stick around long enough to refill some of these reservoirs.

Seawater intrusion is a major issue all along the coast. Once your aquifer goes salty you pretty much need to find a new aquifer.

Also implicated in the Delta which is part of why keeping a certain amount of water flowing into San Pablo Bay is a big deal