Occasionally a homeowner will notice a bad smell coming from the vicinity of plumbing fixtures in the home. This may be caused by “dry trap.” If a fixture such as a shower or bathtub has not been used in a long time, the trap may dry out and thus allow sewer gas to come back into the home. The solution is to run water into the fixture and allow the trap to again fill up with water. If this does not solve the problem, it is time to call a professional from Bell Plumbing and Heating to check it out and make a repair.
Here is an article on some other reasons your drains may smell and ways to fix it from Woman’s Day Magazine and HGTV.