Why Does My Water Smell Like Rotten Eggs?

By Dubya Water | December 10, 2025 | 5 min read

If your water smells like rotten eggs, you are dealing with hydrogen sulfide gas dissolved in your well water. This is one of the most common water quality complaints from homeowners in South Carolina, particularly in the Orangeburg, Bamberg, and Calhoun county areas. While the smell is unpleasant, understanding the cause is the first step toward eliminating it permanently.

What Causes the Rotten Egg Smell?

The rotten egg odor is caused by hydrogen sulfide (H2S), a gas that occurs naturally in groundwater. There are two primary sources:

• Naturally occurring: Organic matter decomposing in underground rock formations produces hydrogen sulfide. South Carolina's Coastal Plain aquifer system is particularly susceptible.
• Sulfate-reducing bacteria: These microorganisms convert sulfate minerals in the water into hydrogen sulfide gas. They thrive in warm, oxygen-depleted environments like deep wells.

Hot Water Only vs. All Taps

Where you notice the smell helps identify the source. If only your hot water smells, the issue is likely your water heater's magnesium anode rod reacting with sulfate in the water. This is a simpler fix. If both hot and cold water smell, the hydrogen sulfide is in your well water itself and requires a whole-home treatment solution.

Treatment Options

Professional sulfur removal systems from Dubya Water use proven treatment methods to eliminate hydrogen sulfide at the point of entry:

• Aeration systems strip the gas from water by exposing it to air
• Oxidizing media filters use catalytic carbon to oxidize and trap sulfur compounds
• Chemical injection uses chlorine or hydrogen peroxide for high concentrations

The right system depends on your hydrogen sulfide concentration, which our free water test measures precisely.

Is Hydrogen Sulfide Dangerous?

At typical well water concentrations, hydrogen sulfide is not considered a health hazard. However, it can corrode copper and steel pipes, tarnish silverware, stain fixtures and laundry, and make your water undrinkable. Addressing the issue protects both your plumbing and your quality of life.

Frequently Asked Questions