Carrok

This is very easy to search. Here's an example: https://waterknowledge.colostate.edu/water-management-admini...

Agriculture is 86% for Colorado. All other sources combined pale in comparison.

And agriculture does not simply "make food". They are often growing feed for animals, so they're making food inputs, which will require still further water to become food for humans.

They also often practice flood irrigation, arguably the least efficient method of watering plants.

Finally, due to "use it or lose it" systems, they have to continue using their water or they won't have access to it next season, so they sometimes literally just dump it on the ground where there aren't any plants to keep their quota up so they don't have access to less water next year.

Yes we need food, but there are a lot of ways in which we can grow just as much or more food without using quite so much water.