Which term describes a natural underground layer that stores groundwater and transmits it to wells?

Prepare for the American Water Works Water Treatment Plant Operator Test. Study with multiple choice questions, each with hints and explanations. Get ready to excel!

An aquifer is an underground layer of rock or sediment that stores groundwater in its pores and fractures and allows it to flow to wells. The water is held in those spaces and moves through the material because the layer is permeable, so wells can tap into it to withdraw water. Recharge is the process that replenishes groundwater from surface water, not the layer itself. A borehole is a drilled opening to access groundwater, and sediment is just the material making up the ground. Because this term specifically refers to the natural underground zone that stores and transmits groundwater to wells, it’s the correct choice.