I used to think a seller's well completion report told you most of what you needed to know about a property's water situation. I was wrong, and it cost a friend of mine a productive decade on his place.
Static water level and yield at completion mean almost nothing without knowing how the well performs under sustained pumping, what neighboring wells exist within the same aquifer, and whether any new drilling has occurred nearby since that report was filed. My friend bought a place in the Gunnison Basin based on a well completion report showing 15 gallons per minute. Within four years, two new subdivisions had drilled into the same formation. His summer yield dropped to under 3 gpm.
Unless you run your own sustained pump test during the driest time of year and pull the state well permit database for every nearby well drilled in the last decade, you don't actually know what you're buying.
Anyone else found that well yield deteriorated dramatically after neighboring development? I'd be curious whether this is worse in shallow unconfined aquifer country or whether confined aquifer folks face different problems.