What does the pink area mean on the RRC's GIS map?

What does this pink area mean on the GIS map? The legend indicates the pink area is an alert area, but there is no information about what kind of alert this is or what it means.

If you identify the alert area, here is what it shows: The groundwater determination is known in this area please use the existing determination letter GAU# 176782. There is no requirement to order a determination within these designated abstracts and no refunds will be given should you choose to place an order.