I used to focus almost entirely on well depth and yield when buying land with groundwater. Biggest blind spot I ever had. What actually determines your long-term water security isn't what's under your feet — it's which Groundwater Conservation District has jurisdiction over that land.
I bought a 340-acre parcel straddling two GCD boundaries without understanding that each district had completely different pumping rules, permit requirements, and export restrictions. One side of my fence line I could pump freely for agricultural use. The other side required permits with production caps tied to acreage. Same aquifer, same well field, entirely different legal reality.
Some districts are well-funded and actively managing drawdown. Others are essentially rubber stamps with no enforcement. That difference will shape your operation more than any yield test ever will.
Before you close, download the GCD's most recent management plan and read the permit denial history. That document tells you where the district thinks the aquifer is heading.
Does your region have meaningful variation between adjacent GCDs, or are you seeing more uniformity than I am in Texas?