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Why Does My Water Smell Like Rotten Eggs?
A rotten egg smell in your water is usually caused by hydrogen sulfide gas, sulfur bacteria, or issues inside your home's plumbing. Here's how to identify the source and the best way to solve it.
Quick Answer
If your water smells like rotten eggs, the most common cause is hydrogen sulfide gas. This naturally occurring gas is often found in well water but can also develop in plumbing systems or water heaters.
The good news is that the smell is usually treatable once the source has been identified.
In most cases, the solution depends on where the odor originates—not just the smell itself.
At a Glance
Most common cause
Hydrogen sulfide gas
Common in
Well water
Can city water smell too?
Yes, sometimes
Usually dangerous?
Typically more of a nuisance than a health concern, but testing is recommended if you're unsure of the cause
Permanent solution
Depends on the source of the odor
Signs You May Have Sulfur in Your Water
Besides the rotten egg smell, you may notice:
Water smells strongest first thing in the morning
Odor becomes stronger when using hot water
Smell from kitchen or bathroom faucets Metallic or unpleasant taste
Black staining around fixtures over time Guests notice the smell immediately
What Causes Rotten Egg Smelling Water?
1. Hydrogen Sulfide Gas (Most Common)
Hydrogen sulfide is a naturally occurring gas that can dissolve into groundwater.
It's especially common in private wells throughout Florida because groundwater naturally interacts with sulfur-containing minerals underground.
Typical signs: -Strong rotten egg odor -Cold and hot water both smell -More noticeable after water has been sitting
Sulfur bacteria feed on sulfur compounds and can produce hydrogen sulfide gas as a byproduct.
They often live inside:
-Well casings -Plumbing -Filters -Water heaters
Although they're generally not harmful, they can create persistent odors and slime buildup.
3. Your Water Heater
If the smell only comes from the hot water, your water heater is a likely suspect.
Some water heaters contain a magnesium anode rod that can react with naturally occurring sulfates and produce hydrogen sulfide gas.
Quick Test
Turn on: -Cold water only
Then: -Hot water only
If only the hot water smells...
Your water heater may be causing the issue.
This is also a troubleshooting step recommended by Sarasota County when determining whether the odor is coming from the plumbing or water heater rather than the incoming water supply.
Is Rotten Egg Smelling Water Dangerous?
In many homes, the odor is primarily an aesthetic problem rather than an immediate health hazard.
However, you should never assume the cause based on smell alone.
Water testing is the best way to determine whether you're dealing with: -Hydrogen sulfide -Iron bacteria -Manganese -Plumbing issues -Another water quality concern
If you're on a private well, routine water testing is an important part of maintaining a safe water supply.
How to Figure Out Where the Smell Is Coming From
Before buying any equipment, try these simple checks.
Does every faucet smell?
If yes...
The issue is likely with the incoming water.
Only Hot Water Smells?
Check the water heater.
Only One Sink Smells?
It may actually be the drain rather than the water.
A simple test is to fill a glass with water, walk away from the sink, and smell the glass. If the odor disappears away from the drain, the drain—not the water—may be the source. This mirrors the troubleshooting advice provided by Sarasota County.
Does every faucet smell?
Sulfur odors are much more common with private wells.
If you're on municipal water, the cause may instead be: -Water heater -Plumbing -Drain -Localized bacterial growth
City Water or Well Water?
The right solution depends on the cause.
Cause
Possible Solution
Hydrogen sulfide
Sulfur filtration system
Sulfur bacteria
Shock chlorination or system cleaning
Water heater
Inspect anode rod or service water heater
Drain odor
Clean and disinfect the drain
Plumbing issue
Diagnose and repair affected plumbing
Installing treatment equipment before identifying the cause can waste money and fail to solve the problem.
Southwest Florida Homeowner Notes
Sulfur odors are one of the most common complaints we see from homeowners using private wells in Sarasota County, Charlotte County, and North Port.
Florida's groundwater conditions make sulfur naturally more common than in many other parts of the country.
Fortunately, most sulfur odor problems can be permanently resolved once the correct source has been identified.
Frequently Asked Questions
Why does only my hot water smell?
Your water heater or anode rod may be producing hydrogen sulfide gas.
Can city water smell like sulfur?
Yes. Although less common, odors can result from plumbing, drains, or water heaters rather than the municipal water itself.
Do I need a sulfur filter?
Only if testing confirms sulfur is entering your home's water supply. The right treatment depends on the concentration and source of the problem.
About This Resource
This guide was created by Otter Water Solutions to help homeowners throughout Sarasota, Charlotte, and surrounding Southwest Florida communities better understand common water quality issues and treatment options. Our recommendations are based on years of experience testing and treating local water conditions.
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