There are a number of conditions which can result in drain odor. Could you be a bit more specific and tell us which drain you are having problems with?
I had this same problem in my master bathroom... we kept getting a foul sewer smell in the room. The problem was a seldom used Garden Style bathtub that was in the bathroom. It seems as though over time, if not used, the water in the tub trap would evaporate, thus no trap to catch the smell when other drains were used in the house... We now run a little water in this tub every week to keep the trap full and the problem has totally gone away... Just an idea!
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