ANN ARBOR, Mich. — March 30, 2016 — Four international plumbing and building codes have adopted the NSF/ANSI 350 standard for water reuse systems, NSF International said in a press release.

The global public health organization developed NSF/ANSI 350: Onsite Residential and Commercial Water Reuse Treatment to standardize the material, design and performance criteria for water reuse systems.

These systems treat greywater on-site, providing an additional source of water for restricted indoor use and reducing the strain on municipal resources, particularly in areas such as California where water scarcity is a growing concern.

Now, the 2015 International Residential Code (IRC), International Plumbing Code (IPC), Uniform Plumbing Code (UPC) and International Green Construction Code (IgCC) require that water reuse systems used for residential toilet and urinal flushing comply with the NSF/ANSI 350 standard to ensure proper treatment of greywater.

NSF/ANSI 350 establishes material, design, construction and performance requirements for on-site residential and commercial water reuse treatment systems. It also sets water quality requirements for the reduction of chemical and microbiological contaminants for nonpotable water use, NSF International said.

The standard requires 26 weeks of continuous testing in order to assess the reliability of the treatment system product over time.

“The inclusion of NSF/ANSI 350, the American National Standard for water reuse treatment systems, in these important international plumbing and building codes is further recognition of the rigor of the NSF International standard and its effectiveness in helping these technologies gain use and acceptance in the marketplace,” commented Jessica Evans, director of Standards Development at NSF International. “Water scarcity is a growing global issue and ensuring certified water reuse systems properly treat greywater will be an essential part of the solution.”