grey water Home › Forums › Archives › Old Bulletin Board Archives › grey water This topic has 1 reply, 2 voices, and was last updated 22 years, 8 months ago by john. Viewing 1 reply thread Author Posts 29 Jun 1998 at 2:54 am #281717 Megan Wilson Ive just been reading a question on the bulletin board regarding grey water, what is it? and how does it affect usa plumbers? 29 Jun 1998 at 3:19 am #303816 john Gray water is from sinks, washing machines, etc. (no sewage in it}. In just about everywhere in the US it is treated the same as sewage. Author Posts Viewing 1 reply thread The forum ‘Old Bulletin Board Archives’ is closed to new topics and replies.