I would like to upgrade my 1/2 hp convertible jet pump in the near future. According to all documentation that I have and what I can see in the basement, the well seems to be located under the house. The house was built in 1971 and the well driller is now out of business. I talked to my neighbor who has lived here for years and he says that the wells in our development were drilled and the houses built over the top of them. As I understand it, I will need to replace components inside the well when the jet pump is replaced. All that can be seen from the basement is the two plastic lines going from the pump through a rough opening in the basement slab. I have no idea how far down the top of the well is. My plan is to bust up some concrete around the opening and dig down to find the top of the well. My questions are: How far down would the well typically be in this situation? Do I need to extend the well casing above the slab, if so what is involved? I am located in Andover, MN.