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Hydrogen Sulfide Chemical Information Sheet. Hydrogen sulfide is a colorless gas with a rotten-egg odor. Some people can smell hydrogen sulfide at very low levels, as low as 0.5 parts per billion (ppb) in air. Most hydrogen sulfide in the air comes from natural sources. It is produced when bacteria break down plant and animal material, often in stagnant waters with low oxygen content such as bogs and swamps. Volcanoes, hot springs and underwater thermal vents also release hydrogen sulfide.
If you notice this smell in your water, it probably contains hydrogen sulfide (H2S) gas. Sources of this gas include:Decay of organic matter or chemical reactions with sulfur-containing minerals in soil and rock. If the smell is only from the hot water tap, the source is most likely your water heater. 2  If the smell is from both hot and cold taps, but only from water treated by a water softener, you may have sulfur-reducing bacteria in your water softener.