What is a typical characteristic of a confined aquifer?

A typical characteristic of a confined aquifer is that it contains groundwater under higher pressure than atmospheric pressure. This pressure is due to the layers of impermeable rock or sediment that surround and block the aquifer both above and below, effectively trapping the water. When a well is drilled into a confined aquifer, the water can rise to a level above the top of the aquifer, sometimes reaching the surface naturally due to this pressure, which is known as an artesian well.

The other characteristics describe various features of aquifers that do not apply specifically to confined aquifers. For instance, being located above the water table or being exposed to atmospheric pressure would relate more to unconfined aquifers, where water can freely recharge from the surface. Additionally, the presence of impermeable layers is what defines a confined aquifer, so stating that no impermeable layers are present contradicts the nature of confined aquifers.