What odor is commonly associated with hydrogen sulfide in water?

The odor commonly associated with hydrogen sulfide in water is a rotten egg smell. This characteristic scent is quite distinct and often serves as a warning sign of the presence of this gas. Hydrogen sulfide is a colorless gas that can accumulate in groundwater and can be produced by the decay of organic matter or by certain industrial processes. In low concentrations, it can pose health risks, and in higher concentrations, it can be lethal. The rotten egg smell is a result of the molecular structure of hydrogen sulfide, which is composed of sulfur and hydrogen atoms, and it is particularly recognizable to humans. The lingering nature of this odor in water systems often prompts further investigation and potential treatment options to address its source.