Jointly developed by the American Rainwater Catchment Systems Association (ARCSA) and the American Society of Plumbing Engineers (ASPE), ARCSA/ASPE 63: Rainwater Catchment Systems was originally published July 2009. Together, the two organizations — with sponsorship from the International Association of Plumbing and Mechanical Officials (IAPMO) — have extensively revised the standard. It is now online for public comment until 11:59 p.m. on Jan. 18.

The original standard has been used in several model plumbing codes for rainwater catchment system criteria, such as the IAPMO Green Plumbing and Mechanical Code Supplement. ARCSA/ASPE 63 is written to protect public health when rainwater is harvested for potable and nonpotable uses, to maximize rainwater utilization, and to ensure environmental benefit. The standard covers proper design, installation, repairs, and maintenance. It also offers guidance for new installations, as well as additions and alterations. Read more.