From which source is groundwater typically withdrawn?

Groundwater is typically withdrawn from an aquifer, which is a geological formation that can store and transmit water. Aquifers consist of porous materials, such as sand or gravel, which allow water to seep through and be stored underground. When water is extracted from an aquifer, it is commonly done through wells that are drilled into the ground to reach these underground sources.

While wells are indeed the structure used to access groundwater and springs can also be natural outlets for aquifer water, the source itself is fundamentally the aquifer, as it represents the stored water that replenishes these other interactions. Reservoirs, on the other hand, are surface water sources and not directly related to the withdrawal of groundwater. Therefore, the most accurate answer regarding the source of groundwater is the aquifer.