The answer to 'sewer line making noise' is that a noisy sewer line is often a sign of a blockage or buildup in the pipes. Common causes include tree roots, debris, grease buildup, or a broken pipe. Symptoms may include gurgling sounds, slow draining sinks or tubs, or foul odors coming from the drain.
In many cases, a noisy sewer line can be fixed with basic DIY methods like using a plunger, drain snake, or chemical drain cleaner. However, if the problem persists or you suspect a more serious issue like a broken pipe, it's best to call in a professional plumber to inspect the line and provide the proper solution.