Sewer Line Sag
 

I had a 4 inch; sewer line break 2 years ago due to improper compaction by the contractor (line broke within 2 years of the build). Dug it up, had it repaired...backfilled properly. Just measured and the line has sagged 1 inch; from the original position it was in after the fix. Should I be concerned about this or just watch it for more settling?

Bellies collect sludge------keep an eye on it-----sounds like you may have unstable soil---good luck