What could be causing the sewer smell in my drain and how can I get rid of it?

The sewer smell in your drain could be caused by a buildup of organic matter, a dried-out p-trap, or a damaged sewer line. To get rid of the smell, try pouring hot water and vinegar down the drain, using a drain snake to remove any clogs, or calling a plumber to inspect and repair any issues with the sewer line.