The cost of borehole drilling can vary significantly depending on several factors. These factors include the region or country where the drilling takes place, the depth and diameter of the borehole, the geological conditions of the site, and any additional services or equipment required. In general, the cost of drilling a borehole can range from a few thousand dollars to tens of thousands of dollars. This cost typically covers the drilling process itself and may not include additional expenses such as pump installation, water testing, or any necessary permits or licenses.