Here’s the most common reason your cold water suddenly looks like iced tea: the city is flushing hydrants or fixing a broken water main. This is basically the municipal version of shaking a bottle of sediment that’s been sitting at the bottom of the pipe for years.
When they turn the water back on, that rust and mineral buildup get stirred up. And guess where it goes first? Right into your kitchen sink. It’s gross, but it’s usually harmless—just iron and manganese.
Pro tip: check with your neighbors. If their water looks like a swamp, you’ve solved the mystery. If it’s just you? Keep reading, Sherlock.
What About Your Own Pipes?
If the neighborhood is fine, the culprit might be your plumbing. Old galvanized steel pipes can rust from the inside out. When they do, tiny flakes break off and float right into your glass.
Why is My Water Brown? (All of a Sudden!) | Drinking Water Base
But why sudden? Did you recently remodel? Install a new water softener? Even turning the main water valve off and back on can knock years of crud loose. It’s like waking up a dragon by accident.
Here’s a test: let the cold water run for five minutes. If it clears up, you’re good. If it stays brown, you might have a bigger issue—like a pipe that’s literally corroding.
