: When I turned off the water line, I turned the downstair faucets on to drain the house.

: Now that the water is back on, the downstairs water pressure is fine, but the water pressure for all the fixtures upstairs is horrible.

: I have checked the kitchen faucet aerator and it is fine (no sediment). I am currently in the middle of my bathroom remodel, so I'm able to check the shower plumbing with no faucet/spray head (straight from the shower pipe) and the water pressure is horrible there too.

: Anybody have a clue?

Do you have galvanized water lines? I could barely see through mine when I removed them during my remodel.