Yes, many do, but not all do.
H2S, Hydrogen Sulfide, is a gas similar to natural gas that originates deep within the eart. When water reaches very deep into the earth, anaerobic bacteria convert some of the dissolved sulphur in the water to H2S, creating that distinct “rotten eggs” sulphur smell.
However, if the water takes a long time to get to the surface for some reason, and the sulphur has the change to oxidize before it hits the surface (in caves, for example), then the hot spring won’t smell like sulphur.
The sulfur smell arrives from anaerobic bacteria that live deep in the spring, below the opening to the surface.
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