Here in my part of Texas, most people do not use a pitless either. However, I have them on all of my wells. Those who have a pitless don't have to worry about freezing. Those without a pitless, try to keep some water running when it freezes. Sometimes it works, sometimes they have to call a pump man. Letting the well head freeze can be expensive. It can even cause plastic well casing to collapse, completely ruining the well, if the motor continues to run when the well head is frozen.