Why Does My Memphis Home Smell Like Rotten Egg?

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If you notice a foul, sulfur-like odor wafting from your bathroom’s sink or kitchen drain, you aren't alone. Many homeowners across Memphis and Shelby County deal with this issue—especially during warmer months or heavy rain.

While your mind might jump to a "sewage leak," in most cases, that “rotten egg” smell comes from hydrogen sulfide gas, which is produced when naturally occurring bacteria interact with minerals in your water or plumbing system.

While alarming, this problem is usually fixable once you identify the source.

What Causes That Rotten Egg Smell?

In Shelby County homes, sulfur odors usually come down to a few common issues:

• Sulfur-reducing bacteria in drains or pipes
• Chemical reactions inside your water heater
• Dry or faulty P-traps
• Organic buildup in older plumbing systems

Is the Smell Coming From Your Water or Your Drain?

These odors can originate from a variety of places, such as your water supply, your water heater, or your drain system—and each requires a different fix.

That's why, before you attempt any repairs, you need to identify the source.

The "Glass Test"

To check if the smell is coming from your drains or from the water, follow these steps:

1. Fill a glass of water from the faucet where the smell is strongest.
2. Step outside into the fresh air (away from the house) and smell the water.
3. Fill a second glass from a different faucet and repeat the process.

Results:

• If both glasses smell: The issue is likely your water heater or the water supply itself.
• If only one glass smells: You have a localized problem in that specific drain or pipe.
• If neither glass smells (but the room does): The odor is coming from the drain pipes (likely the P-trap), not the water.

The Memphis Sands Aquifer Connection

Homes in Shelby County get their water from the Memphis Sands Aquifer—one of the cleanest groundwater sources in the country.

However, this water naturally contains dissolved minerals and sulfates. When those minerals interact with your plumbing—especially inside your water heater—they can create the perfect conditions for sulfur odors.

What’s Happening Inside Your Water Heater?

Many water heaters in the 901 area use a magnesium anode rod, which is designed to prevent tank corrosion. But in our local water conditions, it can:

• React with naturally occurring minerals
• Promote sulfur-reducing bacteria growth
• Produce hydrogen sulfide gas - the classic rotten "egg" smell.

Why Does It Smell Like It’s Coming From the Drain?

Even when your water heater is the source, the smell often appears to come from the drain because:

• Hot water releases the smell at faucets and showers
• The odor lingers as water flows down the drain

Other Common Local Culprits of Smelly Drains in the Mid-South

The "Dry P-Trap"

In the Memphis heat, water in unused drains—especially in guest bathrooms or laundry rooms—can evaporate quickly.

When that happens, the protective water seal disappears, allowing sewer gases to enter your home.

Historic Cast-Iron Pipes

If you live in areas like Midtown, older parts of East Memphis, or in a home built before the 1970s, you likely have cast-iron piping.

Over decades, these pipes:

• Develop rough interiors that trap debris
• Build up layers of organic material (biofilm)
• Create an ideal environment for odor-causing bacteria to thrive, producing sulfur gas as it "eats" the buildup

DIY Solutions for Shelby County Homeowners

How to Get Rid of Rotten Egg Smell in Drain

To disinfect and eliminate odor-causing bacteria:

Option 1:

• Pour ½ cup of bleach down your drains.

Option 2: (Natural Alternative)

• Pour ½ cup of baking soda and 1 cup of vinegar down the drain.
• Let it sit, then flush with hot water

How to Remove Rotten Egg Smell From Water Heater​

If your hot water smells:

• Have a licensed plumber replace the rod with an aluminum version
• Flush the water heater tank
• Disinfect the system using hydrogen peroxide.

How to Fix P-Trap Smell

• Pour a quart of water into unused drains to restore the seal.

How to Get Rid of Smelly Pipes In Older Homes

For cast-iron systems:

• Avoid harsh chemical cleaners that can corrode metal and damage your pipes
• Use an enzyme-based cleaner to naturally break down the organic buildup.

If the rotten egg smell persists, request a service with our licensed plumber at Smith's Plumbing, Heating & Air today.