How to Remove Rotten Egg Smell From Water Heater
If your water heater smells like rotten eggs, start by checking if the smell comes only from hot water—that usually means the tank is the source. Turn off power and drain the tank to flush out sediment and bacteria. Replacing the anode rod often helps since it can react with bacteria to cause odor. You can also treat the tank with hydrogen peroxide for thorough sanitizing. Keep these steps regular to prevent smell buildup, and you’ll find even more ways to keep your water fresh below.
Identifying the Source of the Odor
Before you can eliminate the rotten egg smell from your water heater, you need to pinpoint exactly where it’s coming from. Start by checking if the odor appears only when you use hot water or all water taps. If it’s only hot water, your water heater is likely the source.
Next, inspect the anode rod inside the tank—this rod can react with sulfur bacteria, producing that foul smell.
You can also test your water supply by running cold water directly from the main line; if it smells, the problem might be with your water source, not the heater.
Understanding whether the odor originates from the tank, the incoming water, or plumbing helps you tackle the issue effectively without unnecessary steps.
Flushing and Cleaning the Water Heater Tank
Once you’ve confirmed that the water heater is the source of the rotten egg smell, flushing and cleaning the tank can help remove the buildup causing the odor.
Start by turning off the power supply or gas to the heater. Attach a garden hose to the drain valve at the tank’s bottom, and direct it to a safe drainage area. Open the valve and drain the water completely, flushing out sediment and bacteria.
Close the valve, remove the hose, and refill the tank by opening the cold water supply. Once full, turn the power or gas back on.
Regularly flushing your tank every six months prevents buildup, reducing foul smells and extending your water heater’s lifespan. This simple maintenance keeps your hot water fresh and odor-free.
Replacing the Anode Rod
If your water heater continues to emit a rotten egg smell after flushing the tank, you should check the anode rod.
The anode rod attracts corrosive elements, preventing tank rust, but over time, it can degrade and harbor bacteria producing hydrogen sulfide gas—the source of that foul odor.
To replace it, first turn off power and water supply, then drain some water from the tank to reduce pressure.
Locate the anode rod on top of the heater, usually under a hex head cap.
Use a socket wrench to unscrew it carefully.
Install a new anode rod of the same size and type, then tighten it securely.
Finally, refill the tank, restore power, and monitor for any lingering smell.
Replacing the rod often eliminates the odor effectively.
Treating the Water Heater With Hydrogen Peroxide
Although replacing the anode rod often solves the rotten egg smell, you can treat your water heater with hydrogen peroxide to further eliminate bacteria causing the odor.
First, turn off the heater’s power supply and water inlet.
Drain some water from the tank to lower the water level below the anode rod.
Then, add about one cup of 3% hydrogen peroxide directly into the tank.
Refill the tank with water, turn on the power, and let it sit for at least an hour.
The hydrogen peroxide will oxidize and kill the bacteria responsible for the smell.
Afterward, drain and flush the tank thoroughly to remove any residue.
This method helps sanitize your water heater and reduce odor without harsh chemicals.
Preventive Measures to Avoid Future Odors
Treating your water heater with hydrogen peroxide can effectively eliminate existing bacteria and odors, but keeping that rotten egg smell from returning requires regular care.
First, flush your water heater every six months to remove sediment buildup where bacteria thrive.
Next, consider installing a water softener if you have hard water, as minerals can encourage bacterial growth.
Regularly check and replace the anode rod, since a corroded rod can contribute to odor.
Also, maintain your water temperature at 120°F to slow bacterial growth without risking scalding.
Finally, test your water annually for sulfur bacteria and adjust treatment accordingly.
Frequently Asked Questions
Can Rotten Egg Smell Affect My Health?
The rotten egg smell itself won’t harm you, but it indicates hydrogen sulfide gas, which can cause headaches or nausea in high amounts. If you notice it, you should fix the issue to keep your water safe and fresh.
Does the Smell Come From Cold Water Too?
The rotten egg smell usually comes from hot water, not cold. That’s because the water heater can cause bacteria to produce hydrogen sulfide gas, which smells like rotten eggs. Cold water typically doesn’t have this smell.
Can Water Filters Remove the Rotten Egg Odor?
Yes, water filters can reduce the rotten egg odor if they contain activated carbon or catalytic media. However, they might not eliminate it completely, so you should also address the water heater’s sulfur bacteria causing the smell.
How Often Should I Inspect My Water Heater?
You should inspect your water heater at least once a year to catch issues early. Check for leaks, corrosion, and strange odors regularly. If you notice problems, don’t wait—address them promptly to avoid bigger repairs.
Is It Safe to Drink Water With This Smell?
You shouldn’t drink water with a rotten egg smell because it usually indicates hydrogen sulfide, which can be harmful. It’s best to address the issue promptly and avoid using that water for consumption until fixed.
Conclusion
Now that you know how to tackle that rotten egg smell, you can keep your water heater fresh and odor-free. Start by identifying the source, then flush and clean the tank regularly. Don’t forget to replace the anode rod when needed and treat the tank with hydrogen peroxide for extra freshness. By following these simple steps and taking preventive measures, you’ll enjoy clean, odorless water every time you turn on the tap.
