Well Water Smell Diagnosis Tool

Answer a few questions to narrow down why your well water smells like rotten eggs, chlorine, fish, or something musty, and what to test for.

Frequently asked questions

Should I stop drinking water that smells like fuel?

Yes. Stop using it for drinking and cooking and contact your local health department. Illinois EPA recommends VOC testing for wells that may be affected by fuel.

Sources

Penn State Extension: Hydrogen Sulfide in Water Wells
Minnesota Dept. of Health: Hydrogen Sulfide and Sulfur Bacteria
Illinois EPA: Well Water Testing (VOCs)

Last checked: October 21, 2026