Don Vandervort, Head Homeboy, has written more than 30 DIY home improvement books, been a segment host on HGTV, served as MSN.com's home improvement expert and written countless magazine articles.
Unless there is visible sewage from a backup, foul odors occur when sewer gasses enter a room through drain and vent pipes. This happens most often in a seldom-used bathroom or basement area. Water in the trap evaporates, eliminating the barrier it provides.
If refilling the fixture or pouring water into the drain doesn't solve the odor (after you've aired out the room), the cause may be something else, such as a dead rodent.
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