If you need water on your property, and you don't have the resources or know-how to drill a well, you probably want to know what happens when you call out a well drilling service. In the first place, the well drilling contractors are going to make a plan on where you well is going to go. They have the advantage of knowing where many of the other wells in the area are, and what the ground water situation looks like, and they will likely be able to give you an estimate on how deep they'll need to drill, on whether or not there's an aquifer that's worth trying for.