Hi, Keith.
Once I called my local water district with a question about water pressure.
I got some lonely engineer who was eager to talk and offered to send someone out with a pressure gauge, even though the answer was sure to be "40 psi".
They might not rush to your house if only one spigot runs dirty and the rest of the house has clean water, but you never know. They might worry about contamination from one household pipe backing up into THEIR system.
I should have asked: do you have a well, or city water?
If some pipe is rusting enough to shed black specks, you might want to take slightly expensive preventive action to avoid a burst pipe and who-knows-how-much damage. At least find the water cutoff switch ahead of time, so if you ever have a geyser, you know where to run to shut it down.
