Why is the water from the faucet smelly?

The water released from the faucet tastes like plumbing water. the ban on galvanized pipes, single cold water faucet across country，single cold water faucet at bathtub，single cold water faucet gooseneck the new use of water pipes out of the water has a bad smell, first of all, to clarify the source of the waterworks, the municipal water supply pipeline in small areas and the secondary water supply facilities in the building have no problems，single cold water faucet across country，single cold water faucet at bathtub，single cold water faucet gooseneck