Seven states use the water from the Colorado River. They all use it for drinking water, agriculture, and even industry. There are a lot more people than when the Hoover Dam was built in the 1920's and 30's, a whole lot more. A lot of people moved to Arizona to retire. Los Angeles county went from 2,200,000 people in 1930 to over 10 million today. Five times more people. Same can probably be said of all seven states using the water. More people using the same finite amount of water.
Desalinization of sea water is the only solution for the Southwest and Northwestern Mexico. Now the Rio Grande is starting to dry up. Same problem, more people and same amount of water. Another solution is using water from the Great Lakes piped over the Rockies to fill up the sources of the Colorado River so the water can go downstream.
Even Florida has a water problem. Too much well water is being used and causing sinkholes.
