Here’s the science—don’t worry, it’s the fun kind. Hydrogen sulfide is a natural gas that forms when organic matter decays in the ground.
Think of it as the ghost of a dead plant, trapped in your water pipes. Your city’s water treatment plant works hard to remove most of it, but sometimes a little sneaks through.
Or—and this is the more common plot twist—the smell comes from within your own home. The bacteria living in your water heater can feast on a tiny bit of sulfur and produce that eggy stench.
The Hot Water Heater: Your Secret Stink Factory
Have you noticed the smell only happens when you use hot water? That’s your water heater waving a tiny, stinky flag.
Inside that tank, a “sacrificial anode rod” is slowly dissolving to protect the metal from rust. If the chemistry is just right, this rod can create the perfect breeding ground for sulfate-reducing bacteria.
These bacteria are the punk rockers of the plumbing world. They don’t care about your nose; they just want to party and produce that lovely, pungent gas.
City Water vs. Well Water: The Plot Thickens
If you’re on city water, rotten-egg smells are less common than with well water. But they do happen.
Usually, it means there’s a temporary glitch at the treatment plant. Maybe they added a little too much chlorine, or a pipe got disturbed during construction.
Think of it as a plumbing hiccup. It’s gross, but it’s usually not dangerous at low levels—mostly just a major offense to your nostrils.
