What exactly are aquifers? And how do they allow water from the sky to end up in our faucets? Let’s start with the basic definition: An aquifer is an underground store of water. Sometimes we use that water for everyday life. The Texas Water Development Board estimates about 55% of Texans get their water from aquifers. There are about a dozen major aquifers in the state, the main ones in Central Texas being the Trinity Aquifer and the Edwards Aquifer. Water goes into the ground through caves, sin