When the why does my bathroom smell like fish is not properly ventilated, unpleasant odors can build up. This is especially true if the toilet is used frequently. The warm, moist environment of the room provides ideal conditions for the growth of bacteria and other organisms that produce a foul stench. If a clogged drain or plumbing fixture is the culprit, cleaning them with vinegar may eliminate the smell. Using scented garbage bags in the wastebasket can also help.

Another cause of a fishy odor in the bathroom is rodent carcasses or decomposing bodies. Mice and rats can squeeze through the smallest gaps in homes and decompose there, producing that unpleasant smell. To keep this from happening, it is a good idea to sweep and mop the floors of your home on a regular basis.

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A fishy smell in the bathroom can also be caused by a sewer leak. Sewage gas is produced during the breakdown of organic matter in the drains and can seep into the house if there is a faulty seal or pipe. In this case, a plumber should be called to fix the toilet seal or plumbing vent and clean the pipeline leading from the toilet. This will dramatically reduce the odor.

Faulty electrical wiring in the bathroom can also produce a fishy odor. Loose or old wires can overheat and emit a burnt rubber scent. Having this issue fixed is important to prevent fires and other damage. Before attempting to work on any electrical wires in the bathroom, make sure that the power is completely turned off. This will protect you from injury or death should something go wrong.