City water can have additives in it such as fluoride. This can make the water have an odor to it.
The faucet drips even when the water is turned off.
Minerials in the water.
I have had a problem like that and the reason for odor coming out of just one faucet was because they had another water line teed off of the faucet line that was capped/abandoned and the smell was coming from that line because after I disconnected the abandoned line, the smell went away so I don't know if you would have the same problem or not.
A water faucet is the mechanical device fitted to the water supply pipes over bathroom and kitchen sinks. When turned on they supply water.
Snake your drains
Clean the aerator
ht of bathroom faucet
You go to the bathroom and run on the hot water faucet.
Check the neck of the faucet it is sometimes inscribe their on the back.
One can clean a brushed nickel bathroom faucet by using gentle soap with soft cloth to scrub the surface. One can mix vinegar with water to gentle scrub without scratching the surface of the faucet.
Your pipes aren't clean "Dah"
its not the co.pper line its the faucet stem or angle stop