found your message on the bob Villa site. Did you find any resolution? The 7-year old houses on our street are all having "humming pipes" problems....same as yours: When water runs, there is a humming sound from the basement pipes. When another tap is opened, the humming stops. It can really be loud! Like chinese water torture when one person is showering and the other has to listen to the hum. My neighbor said it was the intake valve. Help! How did you solve this problem at your house?