Why does my water smell like rotten eggs and how do I get rid of it?
Smelly water, or rotten egg odor, is hydrogen sulfide gas that is present in the water. It is not usually harmful at the low concentration that occurs in a household water system. The City maintains a chlorine residual throughout the system that eliminates this smell, but if water sits in any place too long (dead-end lines, unoccupied houses, new developments with only a few homes), the chlorine dissipates and results in the smell. Water heaters with a magnesium anode rode are another common cause of this odor, especially in houses where little water is used.

To eliminate smelly water caused by your water heater, turn your hot water heater up to high for several hours (150-160 degrees). This should kill the sulfur bacteria. Then flush your system, especially your water heater. Also, the magnesium rod can be replaced with an aluminum one, or removed completely. If you live on a dead-end line or in an area with just a few homes, we recommend calling the City Water Department at 952-227-1300 so that the lines can be flushed to assure that there is chlorine present to kill the hydrogen sulfide odor.

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1. How to report a Watermain/Sewer Break?
2. Why is my water sometimes rusty looking?
3. What is my water’s hardness?
4. How do I turn off the water supply to my house in the event of a scheduled plumbing repair?
5. Is the City responsible for plumbing leaks?
6. What is my drinking water quality?
7. Why is chlorine added to our water?
8. Why is fluoride added to the water?
9. Who should I call about a problem or question about my drinking water?
10. Why does Chanhassen flush fire hydrants?
11. How much of the city has treated water?
12. Where can I find my water meter and how can I use it to check leaks?
13. What causes the spots on my dishes?
14. Why does the water sometimes look milky?
15. How can I use my water meter to check for leaks?
16. What is the small metal disk in my yard or driveway?
17. Why does my water smell like rotten eggs and how do I get rid of it?