The quality of the water depends on the location. This particular method of drilling a well works in sandy soil or clay where the water table isn't very deep.

The quality of the water depends on the location. This particular method of drilling a well works in sandy soil or clay where the water table isn't very deep. If you're in mountains or on any topology with bedrock you'll need better equipment, particularly a carbide or diamond tipped bit. And you'll be drilling potentially hundreds of feet. Something like this would most certainly not work in Colorado, it would probably work in Florida or Louisiana.