Bacteria. Tiny, invisible party crashers. They love warm, dark, wet places. Your washer is their VIP club.
When these bugs feast on soap scum and dirt, they burp out hydrogen sulfide. That burp is the rotten egg odor. Your machine isn’t broke. It’s just having a bacterial rave.
Another sneaky source? Your water heater. If the smell hits every tap, not just the washer, your heater is the villain. A magnesium rod inside can react with sulfur in the water. It creates a chemical stink bomb.
The fun fact: It’s a ghost from the Earth
Hydrogen sulfide is naturally occurring. It comes from decomposing plants. It lives in hot springs and swamps. Your washing machine is faking a volcanic vent.
Some people say the smell is like “earth’s farts.” Not wrong. It’s literally a gas that erupts from the planet.
