This document summarizes a presentation on emerging trends in groundwater case law. It discusses how the landmark case Edwards Aquifer Authority v. Day established that landowners own the groundwater beneath their property, but that groundwater conservation districts can still regulate pumping. It notes emerging issues around what regulations constitute a "taking" requiring compensation, and the extent of a GCD's authority. The document also discusses cases related to takings claims, a GCD acting within its authority, the application of oil and gas law to severed groundwater estates, and regulation affording landowners a "fair share" of groundwater. It concludes more cases on takings will likely emerge and the extent to which oil and gas principles will apply to ground