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That pungent rotten egg smell coming from your drain is likely the buildup of biofilm—hair, skin, and soap scum that turns into a black sticky mess. In this case, pouring down near-boiling water, baking soda, and white vinegar will remove the smell. Keep in mind that a rotten egg smell is occasionally a sign of larger sewage line clogs and other related issues.

There is conflicting advice on whether to leave a baking soda and vinegar mixture in a drain overnight. Some sources suggest it can be effective for tough clogs, recommending that you flush the drain with warm water in the morning as part of a monthly cleaning routine. However, other experts advise against leaving the mixture in for extended periods, as its caustic nature could corrode drainpipes if used too often or left in for too long.

Your home has a few telltale signs of a sewer line problem. If you notice multiple plumbing fixtures (toilet, sink, or shower drains) appear to be clogged, call a plumber ASAP. Also, if water appears in the tub or shower when you flush the toilet, you likely have a sewer line issue. A sulfur (rotten eggs) smell and bubbling or gurgling noises at the drain also warrant a check. And keep your eyes peeled for changes to the yard, such as a new indentation or mysteriously soggy grass.

A sewage smell in your crawl space is usually from a damaged or clogged pipe leaking sewer gasses or actual sewage underneath your home, but there are some other common causes. Moisture, from poor or damaged encapsulation or a malfunctioning sump pump, can harbor mold and bacteria, causing a musty smell. Pests can also get stuck in your crawl space and die, which causes a sewage-like odor.