The view is more important than desalination plant.
And - this being California - the crops can be irrigated with Brawndo.
How about you build a desalinization barge and sail up and down In Malibu
“The view is more important than desalination plant.”
Apparently, there is or were oil pumps in a California mall. The mall was built more or less to have structures disguising the pumps. Another was inside a fake synagogue.
https://www.lamag.com/citythinkblog/hidden-oil-wells/
Frankly, I’m thinking if your entire civilization depends on oil, and, it does, you should bring the things out in the open. Paint them nicely or something. But don’t hide them.
Also, a truly efficient desalination plant would require a fossil fuel of worse, nuclear power source. Both are abhorrent to Gaia.