Rivers belong to the state, wells to the landowner
Surface water in Texas is used under water rights issued and tracked by TCEQ. The agency's Water Rights Viewer shows authorized points, a copy of each right, its adjudication final determination, recent water use and current owner. When a right changes hands, the new owner files a Change of Ownership request with TCEQ.
Groundwater works on the rule of capture, which lets a landowner pump the water beneath their land without liability to neighbors whose wells may suffer. The legislature has made groundwater conservation districts the state's preferred way to manage it. These local districts can regulate well spacing and production.
Why Texas isn't on the map yet
TCEQ's mapped points carry no priority date, purpose or amount. For groundwater, the local district's rules, not a state right, decide what a well may pump.