An aquifer containing water that is not under pressure; the water level in a well is the same as the water table outside the well. Underground Injection Control (UIC): The program under the Safe Drinking Water Act that regulates the use of wells to pump fluids into the ground.
a near surface aquifer at atmospheric pressure in which the top of the aquifer is defined by the water table.
An aquifer in which water is not contained by an impermeable layer of rock or soil. The water level in the aquifer may rise or fall according to the volume of water stored, which varies according to seasonal cycles of natural recharge.