Most household sulfur comes from hydrogen sulfide gas, created when bacteria munches on decaying organic matter in groundwater. Think of it as nature’s flatulence, trapped in your aquifer. It’s harmless in small amounts, but your nose knows no mercy.
Fun fact: In some volcanic hot springs, that same sulfur is considered therapeutic. In your bathroom? Not so much. The smell is actually a sign of low oxygen levels in the water, which is why it’s more common in deep wells than in city supplies.
