You may suspect your main sewer line is broken when problems show up across several drains at once rather than in just one fixture. If toilets, tubs, and floor drains start backing up repeatedly, especially on lower levels, it suggests the main line is blocked, sagging, or broken. You might hear unusual gurgling noises from toilets or sinks when you use water elsewhere in the house, as trapped air and wastewater struggle to move through a compromised pipe. Sewer odors inside or outside near the line’s path, along with wet or sunken areas in the yard, also hint that sewage is leaking. Ultimately, the most reliable way to know is to have a licensed plumber perform a camera inspection through a cleanout or removed toilet to visually confirm cracks, breaks, root intrusion, or collapse.
