Everything you flush down the toilet should be gone forever. And it’s easy enough for your sewage system to deal with liquids and solids—as long as you’re not flushing anything you shouldn’t be. But what about gases? Your plumbing has some design features specifically for trapping and safely venting sewer gases, but if something goes wrong, you need a plumber right away. Sewer gas is extremely toxic, so if you have any concerns about it whatsoever, you should treat it like what it is: a major health risk.
