I spent two years before my legal battle believing that a county groundwater availability letter meant I had real protection. It does not. Those letters describe conditions at the time of issuance — they say nothing about what a neighboring municipality or a high-capacity well drilled six months later will do to your aquifer. I bought land in the Hill Country partly because a previous owner had obtained favorable availability documentation. Within four years, a municipal wellfield two miles over drew our shared aquifer down by nearly forty feet during a drought cycle. The letter was worthless in court. What actually matters is the groundwater conservation district's current pumping permit records, any pending large-volume applications, and historical water level trend data from nearby monitoring wells — all public record, all free to pull before you close. Most buyers never ask for any of it. If you are buying in a state with rule-of-capture groundwater law especially, that availability letter is essentially a snapshot of a moment that no longer exists. Has anyone here had a different outcome relying on that documentation?