“Nuclear Energy consuming roughly 400 gallons of water per megawatt-hour, 320 billion gallons of water were consumed by United States nuclear power plant electricity generation in 2015.” And that’s direct consumption in cooling towers, nuclear indirectly uses power in other ways.
By comparison the 550-megawatt Desert Sunlight project in Riverside County estimated 2/3 cup of water per megawatt hour.
The notion that nuclear power is going to significant affect water supplies is without merit.
1. http://large.stanford.edu/courses/2017/ph241/styles2/#:~:tex....
2. http://large.stanford.edu/courses/2017/ph241/styles2/images/...
3. https://en.wikipedia.org/wiki/Palo_Verde_Nuclear_Generating_...
However, wastewater is just water. Look at a long river and towns upstream dump their wastewater into rivers that towns and cities downstream collect as municipal water.