My city is in the middle of the worst drought in recorded history. My showers are typically under 2 minutes and I have to shower with a bucket to catch otherwise wasted water to use to flush the toilet. I also shut the water down when I am wet enough so I can scrub myself without having unneeded water flowing then start it back up to rinse.
Plus, water is damn expensive!
Who here really has the time to stand, think and waste in the shower?
My city is nestled between a rain forrest and lots of natural springs. If we put our water through the normal cleaning process it would come out dirtier then it went it.
We also have a few damned lakes we are having to release water from because we got so much damned rain this past winter.
We have a flat rate we pay for water, sewage, recycling, and garbage pickup and are only charged more if we use a certain amount of water. Mostly just people who water their yard or have a personal pool have to pay the higher fee.