Why Does My Well Water Smell Like Rotten Eggs?

If your well water smells like rotten eggs, you're not imagining it and you're not alone. It's one of the most common calls we get from Central Florida homeowners. The good news: it's almost always fixable, and it usually says more about local geology than about your health.

What that smell actually is

The rotten-egg odor is hydrogen sulfide gas dissolved in your water. It comes from naturally occurring sulfur in the aquifer and from sulfate-reducing bacteria that thrive in the low-oxygen environment of a well and water heater. Neither is exotic. It's just Florida groundwater chemistry.

Is sulfur water dangerous?

At the levels most homeowners notice, hydrogen sulfide is a nuisance rather than a poison. It makes water smell and taste bad and can tarnish silverware and fixtures, but it's not typically a health emergency. That said, a strong smell can mask other water-quality issues, so it's worth testing rather than guessing. If you're ever unsure what's in your water, get it tested.

One trick to narrow it down: which taps?

Before anything else, notice where you smell it:

• Only the hot water smells? The culprit is usually the water heater. The anode rod and warm, low-oxygen tank are a perfect home for sulfur bacteria, and often a heater flush or anode-rod change solves it.
• Both hot and cold smell? The hydrogen sulfide is coming from the well or source itself, and you'll want whole-house treatment.

That one observation saves a lot of guesswork.

How we fix it for good

For source-side sulfur, spot fixes rarely last. The approaches that actually hold up are whole-house water filtration and treatment matched to your water:

• Aeration to release the gas, followed by filtration.
• Oxidizing filtration (catalytic media) that pulls sulfur, and often the iron that rides along with it, out of the water.
• Chlorination or shock of the well to knock back bacteria, sometimes as a first step.

The right choice depends on how much sulfur (and iron) you have, which is why we test first instead of dropping in a one-size filter.

A few things you can check first

• Flush and, if it's due, service the water heater if only the hot side smells.
• Run an outside spigot for a few minutes. A smell that fades may point to the heater or standing water, while a persistent one points to the source.
• Note any staining (rusty or black) along with the smell. That iron clue helps us size treatment.

Common questions

Will a fridge or pitcher filter fix it? Not really. Those help taste at one tap but won't treat the whole house or the source.

Is it my well going bad? Usually not. Sulfur is a water-chemistry issue, not a sign the well is failing.

Can it come and go? Yes. It can get stronger in warm weather or after low use, when bacteria have time to work.

Tired of the rotten-egg smell? Call us and we'll help you get to clean, odor-free water. The answering service is live 24/7.