I'd noted, some time ago, the insanity of the Exalted Ones' plan to triple the Bay Area population without overmuch worry about infrastructure - transportation, water, electricity, and so on.
More recently, we're seeing plans for radical water rationing. After all, California has been running a water deficit (aquifer depletion) for a great many years, even with its pre-expansion population and no drought. So, as the population increases, total (not merely per capita) water usage must decrease.
With leads me to wonder: what will be the effect on sewer systems as the waste/water ratio increases? Surely they were designed for some range of density; increasing it far beyond that will gum things up, no?