Purple is the standard color for pipe adopted by the international utility industry to distribute municipally treated reclaimed water. In late June 2008, a question was raised alerting water reuse professionals to a proposed plumbing code change that would require use of purple pipe
for all graywater systems. The proposal was embedded in updates to the 2009 International Plumbing Code under final development by the International Association of Plumbing and Mechanical Officials (IAPMO). When informed of the proposed change, three professional organizations [Water Environment
Association (WEF), American Water Works Association (AWWA), and WateReuse Association (WRA)] engaged to revise the code. Debate between the three professional organizations and the IAPMO is ongoing regarding the final determination of whether purple is the appropriate color for graywater piping.
Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.