What you're looking at here are very common problems that plague sewer lines. Some more common than others, but any of these could be happening under the ground either with or without showing any symptoms.
Of course, we can't be sure which is any of these things is happening under the ground until we run a camera into the line to take a peek. None of these things automatically mean you need a new sewer line, but sometimes, corrective action may need to take place if they are too severe.
Here is how we Treat them.