Why Your Water Heater Smells Like "Rotten Eggs" When hot water produces a distinct sulfur odor while cold water remains completely clean, the issue resides squarely within the heating tank rather than the main household water supply. This unpleasant scent...
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Why Your Water Heater Smells Like "Rotten Eggs" When hot water produces a distinct sulfur odor while cold water remains completely clean, the issue resides squarely within the heating tank rather than the main household water supply. This unpleasant scent is almost always caused by a natural chemical interaction occurring inside the heating unit. Specifically, sulfate-reducing bacteria present in some municipal or well water supplies react with the tank's internal protective components, creating hydrogen sulfide gas. While the smell can be quite overwhelming, it rarely indicates a public health hazard or widespread municipal contamination. Understanding the Science Behind Tank Odors Tank-style water heaters contain a sacrificial anode rod designed to attract corrosive elements and protect the steel lining from rust. When sulfate bacteria encounter the magnesium material standard in many anode rods, they convert harmless sulfates into hydrogen sulfide gas. Because low-oxygen environment
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