Sulfur/Hydrogen Sulfide Gas
Sulfur occurs naturally in groundwater. It can be produced by certain “sulfur bacteria” in the groundwater, in well water, or in the water distribution system. It does not cause health problems but causes horrible odors, especially in your shower where water has a chance to aerate and the sulfur gas has a chance to build up in an enclosed area.
You will notice a distinct “rotten egg” odor possibly along with a white, grey, reddish brown, or black slime which can promote the growth of other bacteria, such as iron bacteria. The slime can clog wells, plumbing, and irrigation systems. Sulfur can also cause black stains on silverware, toilets and plumbing fixtures and/or corrode pipes and other metal components.