When the main drain line from our house to the street became clogged, we didn't know any better and called Roto Rooter. They were able to fix the problem (tree roots), but it was only temporary and recurred the following year. We were billed $120 for a service that we found out the city sewer department would do for free, as the main drain line is the city's responsibility. Very disappointing that they either didn't know this, or didn't suggest we call the city in the first place.