There is not enough water to irrigate the crops, but you can bet the barn that all the ritzy golf courses are nice and green.
The tap water in parts of North Dakota will burn because of contamination from fracking.
Algae blooms in Lake Erie from fertilizer run-off is making the water unsafe to drink, even if boiled.
The way things are going with wasting water, fracking, pollution, etc. There is a real chance that in 20 years, fresh water will be the new oil.