Sulfur occurs naturally in the ground, and it’s normal for trace amounts of it to get into the water supply that originates in the ground. However, sulfur – which smells like rotten eggs – can sometimes be overly abundant in drinking water. At low levels, sulfur (which appears in two forms – sulfate and hydrogen sulfide) is harmless. At high levels, it can lead to intestinal distress and cause dehydration, particularly in infants. It should be emphasized that an occasional, slight sulfur odor is normal and not cause for alarm. But if the smell is strong and persistent, it could be an indicator of unsafe water and should be reported to your local water company for further investigation.
8 Signs Your Water May Be Contaminated