Susan, I've quickly scanned the other posts and I hope I'm not just repeating what someone else said: IMHO the two biggest problems with wells are (1) flow rate or capacity, and (2) contamination. Joining all three wells together might improve flow rate for the two bad wells, but will almost certainly do nothing good for the good well. Also, if one of the three owners allows contamination (example: well cover comes loose and family pet's feces wash into the well during a storm), it could affect the other two wells.

I wouldn't do it, and I wouldn't expect anyone else to do it for me.

Frank2135