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My name is Billy. You are likely correct that water was off for a service/repair.
You will want to go to each fixture and open faucets on both hot and cold for 30 seconds.
You will also want to unscrew the filter screens on kitchen and bathroom faucets and wash out.
If you have any issue at all please return back to this thread. But a good 30 second purge per fixture should suffice.
No germs..but sediment is likely from the water being shut down. It is very common for grit to come through for a few seconds after service...by cleaning the screens you will keep a steady uniform supply of water.
There is no danger at all....maybe inconvenience of a partially plugged screen...but no danger.