Are ASTM Standards a Solution to the Pipe Color Code Issue?

Color codes are used to designate various flows of water and gases, locations of power lines and other utilities, and pipe materials in guidance or rules set forth by a range of entities. Conflicting color codes for flows of potable water, wastewater, and alternate waters has caused confusion and the potential to result in negative impacts on public health as a result. Over the last three years, the American Water Works Association (AWWA), the Water Environment Federation (WEF), and the WateReuse Association (WRA) have been working with the two plumbing code organizations [International Association of Plumbing and Mechanical Officials (IAPMO) and International Code Council (ICC)] to change their 2009 plumbing code requirement. The 2009 code stipulates purple pipe use for any alternate waters and green pipe for potable water. Alternate waters are any non-traditional source of water to offset potable water use, including onsite treated wastewater, greywater, and rainwater. AWWA, WEF, and WRA presented a white paper in August 2009 to IAPMO proposing revisions that would distinguish between reclaimed water and other alternative water sources. These suggestions, along with comments of other organization and individuals have been rejected as not meeting code change criteria. This paper presents an update on plumbing codes in the United States, an overview of the limited progress that has been achieved in communicating and resolving conflicting codes between various groups, and recommendations to addressing existing conflicts.