Thankfully, the sewage was not in my house, only outside of my house. And also thankfully, the city determined that the problem was with the main pipe, so they are responsible for clearing it. You know it's a bad blockage when the big burly utility men suddenly shout, "Woah!!!" from across the street! Our house just so happened to the be lucky "release valve" for the back up! Great. How did we discover this? You don't want to know. Let's just say it has to do with items coming up from our sewage line that nobody in this house uses!
Hope you have a very uneventful day!