I get the same thing in one of my master baths sinks. We thought it was the water also but I believe it is actually coming from the drain. I use the sink all the time but if I don't run the water for 8 hours or so, I can smell it. I usually pour a combination of Clorox and water down the drain and don't run the water for an hour and usually it takes care of it for about 3 weeks or more. Give it a try.
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