Diane: Start wiht this agency. If the state of Pennsylvania requires permits for wells it will be as simple as contacting this agency for assistance..... http://www.paofficials.com/index.php
Or if that doesn't help then contact every major well water driller in the area and ask if they have ever drilled a well on the property in question. They will have maps and records dating back to when the well was drilled. Good Luck!