Nearly every state and jurisdiction in the U.S. requires that chemicals and additives used to treat public drinking water supplies be certified to NSF/ANSI 60: Drinking Water Treatment Chemicals—Health Effects. Products certified to NSF 60 have been independently evaluated for contaminants that can potentially cause adverse effects to human health. However, NSF/ANSI 60 defines neither the frequency of ongoing surveillance required for manufacturing facilities, nor the retesting frequency of certified products. As a result, there have been variations in the manner in which certification bodies have determined continuing compliance for certified products.
Published in 2012, NSF/ANSI 223: Conformity Assessment Requirements for Certification Bodies that Certify Products Pursuant to NSF/ANSI 60: Drinking Water Treatment Chemicals—Health Effects, provides surveillance requirements for certification bodies that test and certify chemicals and additives to NSF/ANSI 60. NSF/ANSI 223 specifically defines the inspection activities at a manufacturer’s facilities, including a review of the facility’s quality management system and other documentation. In detailing these specific requirements, NSF/ANSI 223 gives third-party certification bodies clear guidance regarding surveillance activities, and assures manufacturers of equivalent surveillance practices between various certifiers using NSF/ANSI 223.