Why Does My Cold Water Smell Like Rotten Eggs

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For people on well water, you’re dealing with Mother Nature’s prank. Groundwater often contains dissolved sulfur minerals. When the water sits in your pipes or pressure tank, it’s a chemistry experiment gone wrong.

Fun fact: some wells naturally have sulfur-reducing bacteria living deep underground. These guys don’t need oxygen—they breathe sulfur compounds instead. That’s hardcore. They produce hydrogen sulfide as a byproduct.

Don’t worry, though. Most of these bacteria are harmless to humans. They’re just rude roommates who refuse to flush.

Is It Dangerous?

The short answer: probably not. You’d need to inhale massive amounts of hydrogen sulfide gas to feel sick. The tiny amounts in tap water won’t hurt you—it’s more of a nuisance than a hazard.

However, there’s a spicy exception. If the smell is sudden and overwhelming, combined with a metallic taste, stop drinking it immediately. Call your local water authority or a plumber.

Otherwise, feel free to laugh at the fact that your faucet is imitating a devil’s egg salad.