Looks like on average the data shows 42% agricultural. https://water.ca.gov/Programs/California-Water-Plan/Water-Po...
The reason this is there is to downplay the outsized use in agriculture, and also to shift some blame to folks that voted not to allow this water to be used in the first place.
But still, if you want to cut spending and are looking for where your money is spent, you don’t include money you choose not to earn in your list of spending.