Why Does My Water Smell Like Rotten Eggs?
A rotten egg smell in your water is commonly linked to sulphur compounds, hydrogen sulphide gas, stagnant water, bacterial activity or mineral-heavy source water. The fix depends on whether the smell is coming from the tank, the pipework, the hot water system or the water source itself.
Rotten Egg Smells Usually Point To Sulphur, Bacteria Or Stagnation
Stale tank water, biofilm in pipework, mineral-heavy water and some hot water systems can all create a sulphur-like smell.
What Causes A Rotten Egg Smell In Water?
That sulphur smell is often caused by hydrogen sulphide gas or bacteria interacting with minerals in the water. Sometimes the odour is in both hot and cold water. Other times it only appears at one tap or only in the hot water, which helps narrow down the source.
Hydrogen Sulphide
Sulphur compounds in the water can create a strong rotten egg smell, especially in bore or stagnant water systems.
Stagnant Tank Water
Poor circulation, organic build-up or neglected tanks can create odours over time.
Biofilm In Pipework
Bad smells are not always from the tank itself. The pipework can also harbour odour-causing build-up.
Hot Water System Issues
If the smell is only in hot water, the hot water system may be contributing rather than the tank alone.
Bad Sulphur Smells Usually Need More Than A Quick Fix
If your water smells like rotten eggs, simply changing a filter may not be enough. The source of the smell often needs to be identified properly first, whether that means tank cleaning, pipe sanitising, system adjustments, water testing or a review of the hot water system.
What You Notice
Strong sulphur smell, stale odour at the tap, bad-smelling hot or cold water, or smells that return after sitting unused.
What It Often Means
Stagnant water, sulphur compounds, bacteria, pipework biofilm, mineral-heavy source water or hot water system involvement.
Signs You May Need System Attention
- Your water smells like rotten eggs or sulphur.
- The smell is stronger first thing or after water has been sitting.
- You are unsure whether the smell is from hot water, cold water or both.
- Your tank has not been professionally cleaned for years.
- You suspect stale pipework or biofilm in the system.
- Your household relies on tank water or bore water for daily use.
What Might Be Recommended?
- Professional tank cleaning.
- Water testing to identify sulphur, bacteria or mineral issues.
- BioCleanse pipe sanitising to treat odour-causing pipework build-up.
- Filter replacement or review of the filtration setup.
- Checking the hot water system if the smell is only on hot water.
- Additional treatment if bore water minerals are contributing to the odour.
A Rotten Egg Smell Usually Points To A Bigger Water Quality Or System Issue
The smell itself is the symptom. The real issue may be inside the tank, the pipework, the hot water service or the source water. Finding the real cause is the key to fixing it properly.
Tank Hygiene Issues
Sludge, organic material and poor tank maintenance can contribute to stale and sulphur-like odours.
Pipework Build-Up
Biofilm and stagnation in the pipes can create bad smells at the tap even when the tank water looks normal.
Source Water Minerals
Bore water or mineral-heavy water can contribute to hydrogen sulphide and persistent rotten egg smells.
Frequently Asked Questions
Some of the most common questions we hear about rotten egg smells in water.
Why does my water smell like rotten eggs?
This is commonly linked to hydrogen sulphide gas, sulphur bacteria, stagnant water, biofilm or mineral-heavy source water.
Why does only my hot water smell bad?
If the smell is only in the hot water, the hot water system may be contributing rather than the tank itself.
Can tank cleaning help with a sulphur smell?
Yes, if the smell is being caused by sludge, organic build-up or poor tank hygiene. But sometimes further treatment is needed as well.
Should I get the water tested?
Yes. If the smell keeps returning or your household drinks the water, testing is one of the best ways to identify what is causing the problem.
Get Help With Rotten Egg Smelling Water
We can inspect your tank, assess the filtration, recommend water testing and help work out why your water smells like sulphur or rotten eggs.
Areas We Cover Across The Sunshine Coast
We help homeowners across the Sunshine Coast with smelly water, tank issues, filtration problems and water quality concerns.