Final answer:
The water in the High Plains aquifer system has not been equitably divided by treaty among the states overlying it.
Step-by-step explanation:
The statement is False.
The water in the High Plains (Ogallala) aquifer system has not been equitably divided by treaty among the states overlying it. The High Plains aquifer system spans multiple states including Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming.
It is a groundwater resource that is shared by these states, but there is no specific treaty that has divided the water among them.