Generally speaking people purchasing a home or lot with a well should have the well tested. Along with testing the well the pump and related equipment can be checked for problems. The water should also be checked for bacteria and minerals. Certain wells require a more extensive test than others. Deep wells with limited production and small pumps take an extended period of time just to pump out borehole storage, let alone any formation storage. Only then can any testing be done. If the pump is sized too small a test may not be feasible. This is where some contractors have had trouble and end up in court. The amount of time required, far exceeds that allotted by a two-hour test. Formation storage is an un-known factor and has led to many a bad well test when the well was drilled or tested after. Failure to allow for the possibility of formation storage when testing, results in false production rates being reported. As the TV show says, it all can be calculated with math if you know what to look for. — David Nequette