![]() Most people can detect hydrogen sulfide levels well below 0.5 mg/L. While the gas is poisonous and flammable, the human nose can detect it well before it causes health concerns. Hydrogen sulfide in water is an aesthetic concern that causes a disagreeable taste and odor to the water. In this case, the softener provides a favorable environment for sulfur-reducing bacteria to grow. In rare cases, the addition of water treatment equipment, like a water softener, may cause the production of hydrogen sulfide. The magnesium rod can chemically reduce sulfates to form hydrogen sulfide. ![]() Water heaters are fitted with a magnesium rod to inhibit corrosion of the heater. In this case, chemical reactions within the water heater may be the source of the rotten egg odor. Sometimes hydrogen sulfide may be noticeable only in the hot water in the home. Hydrogen sulfide problems are most common in wells drilled into acidic bedrock such as shale and sandstone. Although sulfur-reducing bacteria can impart taste and odor in the water, they do not cause health concerns for humans. Hydrogen Sulfide occurs naturally in groundwater as a consequence of the activities of sulfur reducing bacteria. These bacteria feed on small amounts of sulfur in the water and thrive in the low oxygen environments present in groundwater wells and plumbing systems.
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