"sligo" wrote in message
news:kii1e.210240$FM3.164881@fed1read02...
A year old house is starting to have a noise problem when water, hot or
cold, is turned off in all locations. Coming from the pipes behind the
walls, a low frequency groan lasting several seconds .

snip

You don't happen to live in or near Amityville, do you?

Steve ;-)