Look dude it is you who doesn't understand how it works, at least as far as it concerns Tucson: https://storymaps.arcgis.com/stories/70f626809fd84e228c0f32a... https://www.tucsonaz.gov/files/water/docs/coloradoriver.pdf

They tried "to the tap" and it pissed everyone off because the river water leeched out all of the rust in people's pipes.