One suggestion — Although the wellhead seal looks decidedly nonmetallic, there may be one good reason for connections to both the casing and new municipally-connected feed—a metal well casing often makes an outstanding grounding electrode. The old 6-inch casing at my rural house measured <2&#8486; with a three-point test, and that is often considered “utility-substation grade.” {The equally-old ‘driven’ ¾-inch-pipe electrode was 65&#937;.}