A big win for on-site greywater reuse systems was announced yesterday when it was revealed that the NSF-350 standard is now recognized in the 2015 International Residential Code, 2015 International Plumbing Code, 2015 Uniform Plumbing Code, and 2015 International Green Construction Code. These influential codes are important because they often help shape local and state building codes, such as the California State Plumbing Code.
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Water reuse systems reduce costs associated with energy and water use by treating water onsite. In areas such as California, where water scarcity is a growing concern, these systems can provide an additional source of critically needed water and reduce the strain on municipal resources.
Under these codes, should a builder choose to use an onsite water reuse system, certification to NSF/ANSI 350 is either required or constitutes a path to acceptance under these codes. NSF/ANSI 350 certification ensures that water for toilet and urinal flushing (and in some codes for surface irrigation) is properly treated for use in these applications.
NSF/ANSI 350 establishes material, design, construction and performance requirements for onsite 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. Treated greywater can be used for restricted indoor water use such as toilet and urinal flushing, and for outdoor unrestricted water use such as lawn irrigation.
To learn more about NSF-350 please visit this page on the NSF website.