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Depth of deep wells usually exceeds 10 m, and they are created using a specific drilling rig, that is apllied for underground drilling. There exists a misunderstanding that the more profound the water is, the cleaner it is and less exposed to contamination. As a principle it is, but not always, because frequently more profound water is more contaminated with iron. To determine the depth of the removal work for the build well, suitable geological investigations is supposed to be carried out. Fundamental geological inquiry in the case of water reservoirs consists of recognizing the geological structure and hydrogeological circumstances in the interested area. It is as well worth bringing up that such investigation can help save expenses if it happens to reveal that in the place where we wish to drill, unfortunately there is no appropriate aquifer. The point of drilling or wellbore is indicated by a hydrologist depending on available studies.