[SomeCallMeTim]

Water rights in Colorado are...complicated. Aurora, Colorado doesn't have enough for its population.

So it pumps water out of the river, sends it to people, purifies the result, and pumps it back into the river.

Three times. At different locations. So really they're already drinking their sewage water, only slightly diluted with the water from Denver's sewage water...and heading downstream to supply water to Utah, Nevada, and Southern California.

Can't find the reference, though. Sorry.