Why does my water smell like rotten eggs?
A rotten-egg odor can come from a harmless chemical, hydrogen sulfide, dissolved in water. Usually this comes from groundwater (well water) with sulfur compounds.
Many of the substances that cause bad taste or odor in drinking water will not make you sick. However, if you detect an unusual odor or taste, contact us at (406) 721-5570.
More information can be found at the Environmental Protection Agency’s website at http://www.epa.gov/safewater/faq/faq.html