The answer to 'why is my sewer line overflowing' is that there is a blockage or obstruction in the sewer line, preventing wastewater from properly draining. This can be caused by a variety of issues, including tree roots, debris buildup, a collapsed or broken pipe, or a problem with the municipal sewer system.
Some common symptoms of a sewer line overflow include water backing up in sinks, toilets, or floor drains, a foul odor coming from the drains, and water pooling around the home's foundation. If you're experiencing any of these issues, it's important to address the problem quickly to prevent further damage and health hazards.