The answer to 'sewer line foul smell' is that a foul odor coming from your sewer line is typically caused by a blockage or damage in the line. This can allow sewer gases to back up into your home, resulting in an unpleasant smell. Common causes include tree root intrusion, pipe corrosion, or a clogged main sewer line.
Symptoms of a sewer line problem include foul smells, gurgling noises from drains, and slow draining sinks or toilets. If you notice these signs, it's important to address the issue promptly to prevent further damage and health hazards.