O2addict. Wow! Thank you. I did not know that. I will pull some more info on that this weekend. And, good point about the non-written easements — that is pretty much what the city and county told me when I approached them about this issue and started my research. It’s kind of well understood that most property owners would want to cooperate if they share a sewer.
I don’t know that I have a great handle. I have just done a lot of asking and researching. And, I really hope some of this benefits others too.
One other interesting note (possibly only to me). I found another neighbor on my street had a similar issue. Shared sewer line broken by construction only he was the person who did the accidental breaking. His way of handling was to 1) apologize to the other neighbor and 2) replace their ENTIRE line. I think that is more than I would actually expect but that behavior seems a bit more common in my area than my neighbor.