Water problems
Rotten egg (sulfur) smell in water
Why your water smells like rotten eggs, how to tell if it's the well or the water heater, and the treatments that remove hydrogen sulfide.
A rotten egg smell is almost always hydrogen sulfide gas. It's common in well water, where it can come from the groundwater itself or from sulfur-reducing bacteria in the well or plumbing. It can be noticeable at very low levels, long before it's a health concern, but it can tarnish silverware and corrode plumbing.
Find the source first
| If the smell is… | Likely source |
|---|---|
| Only in hot water | The water heater. The anode rod can react with sulfate in the water. Replacing it with a different anode type often fixes it. |
| In hot and cold water | The well or groundwater |
| Only after water sits unused | Bacteria in the well or plumbing |
| Only at one faucet | The drain, not the water |
Treatment options
On a well, the Puronics IronMax iGen 10P uses air-injected oxidation and a manganese greensand bed. In general, sulfur treatment uses oxidation (aeration, chlorine, or hydrogen peroxide) followed by filtration, which also removes iron and manganese if they're present. If bacteria are involved, the well may need disinfection. A sulfur smell on public water is unusual; tell your utility.
Smell tells you something is there, but not how much, or what else is in the water. The EPA recommends regular testing for private wells[1]. A free in-home test is the place to start before choosing well treatment.
Solutions that help
Systems we'd typically recommend
From the WÜDR range. The exact model, configuration and sizing follow your water analysis.
What drives the price? See Well water treatment cost. Every recommendation starts with your free water report.
Where this comes up in our service area
Common questions
Is rotten egg smell in water dangerous?
Hydrogen sulfide is usually a nuisance at the levels found in household water, but the smell can come with bacteria or other issues. Test the water to find out.
Will a water softener fix the smell?
Not by itself. Softeners don't remove hydrogen sulfide; it takes carbon, oxidation and filtration, or fixing the water heater.
Clean water starts with knowing what's in it.
Sources
- U.S. EPA: Private drinking water wells. www.epa.gov/privatewells
EPA records retrieved Oct 2026 from the EPA SDWIS and UCMR 5 public datasets. Utility records describe a water system, not the tap in your home. Records can lag and may be incomplete.