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If this is a new occurrence (it did not happen in the past), the most likely cause is a dry drain trap in the downstairs bathroom. A drain trap is a double U shaped arrangement for the drain that allows water to be trapped in the U-shaped connection. The purpose is to form a water plug that prevents sewer gasses from escaping back through the drain hole. When this water evaporates, the gases can get through. You can see this arrangement if you can view the drain pipe under a sink. It is visible under most bathroom and kitchen sinks.

To solution to the problem is to dump water down the drain to fill the trap. This occurs most often in unused bathtub drains and floor drains. You may need to look under a floor rug to see if you have a floor drain. If you have a floor drain, just pour about a quart of water down the drain to fill the trap.

If this does not solve your problem, you may need to call a plumber to check out what is called the vent stack to see if that, or some other issue, is causing the problem.

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12y ago

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