water quality · guide · TN LLP #5045
Iron and Sulfur Smell in Well Water
The rotten-egg smell and the orange staining, and how each is treated.
Short answer
Orange or brown staining is iron. A rotten-egg smell is usually sulfur, either in the water or produced in the water heater. They are separate problems with separate fixes, and a water softener on its own is not the answer to either.
Iron and sulfur are the two complaints we hear most from well properties, and they are frequently misdiagnosed. People buy a softener because that is what gets advertised, and are then surprised the staining and the smell are still there.
Iron — the staining one
Iron shows up as orange or reddish-brown staining on fixtures, in tubs, and in laundry. Water may run clear from the tap and then stain as it sits, because the iron oxidises on contact with air.
How it is treated depends on what form it is in and how much there is, which is a testing question rather than a guessing one. This is exactly where buying equipment off a shelf goes wrong.
Sulfur — the smell one
The rotten-egg smell is hydrogen sulfide. The important diagnostic step is whether it is on the cold side as well as the hot. Smell on both usually means it is in the supply. Smell only on the hot side often means it is being produced in the water heater, where certain water chemistry reacts with a magnesium anode rod.
That distinction matters a lot, because the second case is often solved by changing the anode rod rather than by installing a treatment system.
What we do
Test first, then specify to what is actually there. Treating the water after it reaches the house is squarely our work.
The well itself, the pump, and the pressure tank are separately licensed in Tennessee. We do not touch those, and we will say so plainly and point you to a well contractor rather than take it on.
What we would do
Do not buy treatment equipment before testing. Iron, sulfur, and hardness are three different problems, and the system that fixes one will not fix the others. If the smell is only on the hot side, ask about the anode rod before anything else.
Permits
Some plumbing work requires a permit and an inspection, and some does not. Whether one is required for your job is determined by the Authority Having Jurisdiction — the city or county building and codes office for your address — and it is at their discretion.
Usually requires a permit
- Water heater replacement and tankless conversion
- Whole-house repiping
- Water service line and sewer line replacement
- Gas line installation and repair
- Relocating a fixture to a new position
Usually does not
- Drain cleaning and clearing blockages
- Emergency and repair work
- Like-for-like fixture replacement
- Water heater repair
- Camera inspection and diagnostics
This is general guidance rather than a ruling, and it can differ from one town to the next. The Authority Having Jurisdiction makes the determination. Across the Bradley–McMinn corridor we pull the permit and book the inspection ourselves. Inside Hamilton County and Chattanooga the permit office does not accept an application from our license class, so permit-required jobs there are referred to a licensed partner who does the work and meets the inspector.
Common questions
Iron and Sulfur Smell in Well Water — questions
The smell is only in the hot water. Why?
Will a softener remove iron?
Do you work on the well itself?
Are you licensed?
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