Purple Pipe for All Waters?

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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.

Keywords: graywater; plumbing code; purple pipe; rainwater harvesting; reclaimed water; stormwater

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864709793954556

Publication date: January 1, 2009

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  • 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 These proceedings are not peer reviewed.

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