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If you suspect the pump is old, you need to be concerned about possible damage to the pump from the fall; it could be leaking PCB's or oil and contaminating the potable water. PCB's are man-made chlorinated hydrocarbons similar to pesticides. The manufacture of PCB's was banned by the EPA in 1976 and most uses of PCB's were banned in 1979. Capacitors within the motors of certain two-wire submersible pump models manufactured before 1980 contain PCBs, which could be leaking into the surrounding water. PCBs are not a concern in submersible pumps manufactured after 1979 or in pumps with three wire, water-cooled motors. If you suspect the pump may have PCB's, have the well water tested before consumption is allowed.
Based on this information, a diligent attempt must be made to remove the pump, but caution is warranted. Leaving the pump in the well can result in contamination, but excessive force while fishing for the pump can cause physical damage and oil can be released into the well. Observing the position of the pump by inspection with a downhole TV camera aids in selecting the proper fishing tools. If fishing is unsuccessful, entombing the pump in cement grout or pump/casing extraction by overdrilling may be necessary. A new pump can then be installed.
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Best of Luck, Brian
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