I’m a Plumbing contractor, is this your house you are talking about?
If a house lasts long enough then the line in the yard will have to be replaced, just as the line to the septic eventually gets replaced, but other than that, the septic is the one that requires routine maintenance, not a sewer line.
One installs a sewer line from the house to the property line when the house is built, and that should be it for 50 or 70 years.
Since I always, since childhood, had septic, I am very careful about what goes in the system. So for me, it (and being stuck with town water) seems like punishmet for other people's careless use.