Absent changes in usage, the increase will be due to increases in the groundwater production charge, which is the rate per acre foot you pay for water produced. Each year the groundwater production charge is approved by the Board. Well owners are notified by the District of the proposed rate increase via letter at least 45 days in advance of the Board meetings in which the proposed increase would be discussed and considered. This letter gives meeting times for public comment and explains the process to protest the increase should you wish to do so.
If you are growing commercial agricultural crops and your crop factor has gone up, the combined crop factor increase plus annual rate increase likely resulted in a larger than anticipated water bill.