What's Causing That Strong Rotten Egg Smell That's Coming From My Drain?

You’re standing at your bathroom sink, putting soap on your hands, and as you go to turn on the water, you notice a smell. It’s not just a faint smell either! The longer you stand there, the more it begins to waft up into your nose. It’s the smell of rotten eggs – and it’s coming from your drain!

Why does my tap only sometimes smell like rotten eggs in 2 of our 5 faucets? I sometimes don't use the water in both places because of the rotten egg smell and

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