I used to assume that a pre-purchase well log told you what you needed to know about groundwater on a parcel. Static water level, pump rate, done. I bought a 160-acre piece in 2014 with a well log showing solid numbers, and within four years I was watching the pump pull air two months into irrigation season.
What I didn't do — what almost nobody does before closing — is pull the declining trend data for the surrounding management district. Most Designated Groundwater Basins in Colorado publish annual saturated thickness reports by township. A single well log is a snapshot. The trend data tells you the actual story: how fast the aquifer is dropping in that specific section, and what your neighbors are pumping.
If you're buying dryland ground, fine. But if any part of your production plan assumes irrigation, you owe it to yourself to request five to ten years of district monitoring data before you write an offer.
Has anyone else seen buyers in your region get burned by relying on a single well test over trend analysis?