[Red in Blue PA]

Call your city maintenance department because it sounds to me like your plumber is trying to scam you.

On the contrary, these guys were not trying to sell us anything. They said we had years before this should prove to be a problem again, as they removed some roots in the pipe.

[Cyber Liberty]

They said we had years before this should prove to be a problem again, as they removed some roots in the pipe.

If that is the case, the Copper Sulfate solution is a good one. They sell it in the plumbing department of the hardware store. It's not expensive, but you have to keep on top of it and do it regularly.

I had this happen, and the roots got too thick so I had to have it dug up and fixed. The city's responsibility ends at their pipe, which makes the junction your problem. Sorry.