What is an aquifer? December 9, 2015 By Jennifer Wilson Training Videos video 0 Most wells, whether they’re used by community water systems, industries, or private well owners, draw their water from an aquifer. An aquifer is a geologic unit—usually either sand and gravel or cracked and creviced bedrock—that can provide useable quantities of water to a well. This video explains further. Click here to sign up for our free well care e-course. Comments are closed.