The sewage smell in the bathroom usually has several common causes. Below are the key ones — from the simplest and most likely to more serious.
The most common reason is a dried trap under the sink, bathtub, or shower. Water in the P-shaped bend of the pipe forms a water seal that blocks the entry of odors. If the plumbing has not been used for a long time, the water may have evaporated. The solution is simple: run water for a minute in all drains.
Another common issue is a clog. Accumulated hair, soap, and dirt begin to decompose and emit an unpleasant odor. In this case, it is advisable to clear the drain with a plunger or snake.
If the smell persists, the causes may be more serious: a cracked trap, a worn-out seal under the toilet, a clogged vent pipe, or a malfunction in the main sewer line. Sewer gas contains methane and hydrogen sulfide, so the problem should not be ignored.
In summary: start by checking the traps and cleaning the drains. If the smell does not go away or a leak appears, it is better to call a professional plumber for an accurate diagnosis and safe repair.
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