The price for drilling a water well is typically $15 to $30 per foot or $1,500 to $3,000 for a 100 foot well. This can vary depending on the geological terrain where access might be difficult or limited. In that case the cost would be higher.
A complete water system will include other costs for items such as a water pump and storage tank, piping and electrical wiring for power. These can add another $2,000 to $8,000 to the final cost. The depth of the well, the distance from the house and the size of the pump will also factor in the total cost.