Everybody else probably knew right away why the domestic water map looks a it does. It wasn't intuitive for this California native.
Many years ago I took my niece on a summer trip to visit family members we didn't get to see much.
At my cousin's place in Arkansas, I mentioned that their vegetable garden was looking a little poorly, with tomatoes and such seriously drooping, and asked if they knew why. "Well, it hasn't rained much this summer." "Why don't you water it?" "Do what?"
The concept was quite foreign to them.
Here is a map to compare with the one above:
https://www.currentresults.com/Image...ion-summer.jpg
Bruce's map includes well water and delivered water, but not rainfall.
If you are going to grow stuff in the highest consumption states, you can't rely on water falling on it.