It can be done on a community level, not individual houses. In Portland, we have several HUGE water towers that hold tens of millions of gallons that supply pre

It can be done on a community level, not individual houses. In Portland, we have several HUGE water towers that hold tens of millions of gallons that supply pressurized water to neighborhoods, like the Denver Water Tower. They also have them on the ground in hills where you can't see them, supplying houses below. For fire suppression, it doesn't have to be potable water. It's just a quick thought I had. I know if I lived there and there was a fire breakout and heading towards me, I'd stick a sprinkler up there whether there was a water shortage or not.