The answer to 'why is my sewer line making gurgling noise' is that a gurgling sound in your sewer line is typically a sign of a blockage or obstruction in the line. This can be caused by a buildup of debris, grease, or even tree roots that have grown into the pipes.
Some common symptoms of a gurgling sewer line include slow draining sinks or tubs, foul odors coming from the drains, and water backing up into your home. If left untreated, a gurgling sewer line can lead to more serious issues like sewage leaks or a complete blockage.