Why Is Sewage Exploding Out of the Toilet?
I had what appears to be a sewer backup into my bathroom. Sewage exploded out of the toilet. What is the cause?
What you have is more than a temporary toilet clog – it’s likely a branch line blockage between the bathroom and the main sewer. You'll probably need to hire a professional plumber to clear and clean the drain line. If you don't have a clean-out port big enough to accept a cable with 3-inch blades, the service technician will have to pull up the toilet in order to thoroughly snake the line.