The Cornwall Borough Water & Sewer Dept does require a permit prior to the digging of a well.  The law requires residents to use the public water system for domestic use if available.  Wells drilled for the purpose of Geo-thermal heat are permitted.  Well locations must be tracked per Department of Environmental Protection (DEP).
The permit for well digging is available on line under the forms tab.
Please remember to call 811 (Pa One Call System) prior to any dig.