Other people just don't care. I know a Mojave desert community far to the east of LA where water delivery happens by truck. It's a very harsh and unforgiving environment, but I really liked it when I worked out there some years ago and have considered moving there because I like solitude and am comfortable with a very frugal/minimal lifestyle.

Last year I ran across an LA Times article about how people were making different life choices due to the pandemic, and and other factors - specifically moving from LA to this place. In contrast to locals who tend to build low houses and choose colors that blend with the desert landscape, these people were painting their houses bright white and, I kid you not, installing swimming pools.

Would a white house reflect more height and be cooler inside ?

Are they really duty bound to disclose this? What about fire, flood, earthquake and any other risk. My experience is they don't, other than legally mandated things like asbestos or lead.

I bought a house in California, and the docs include a bunch of details on potential disasters, natural and otherwise. Dam inundation maps are engrossing - there's a dam over San Leandro that could put water on the OAK runways.

That said, I see wiggle room on "if nothing changes there eventually won't be enough water", even if we all know that in practice nothing will change in time, so I don't know how that actually plays out.