NSF International, Ann Arbor, Mich., has certified the National Association of Pipe Fabricators (NAPF) flanged and grooved ductile-iron pipe products to NSF/ANSI 61 2002. NSF is involved in standards development, product certification, education and risk management solutions for public health and safety. Compliance with all phases of the NSF Certification Program is a requirement for continued membership in NAPF.

Member companies of NAPF whose products are certified bear the NSF Mark and are listed on the NSF web site (www.nsf.org) and in NSF-certified product listing books. NSF audits each facility annually, verifies formulations, performs laboratory testing of the products and ensures compliance to allow for continued use of the NSF Mark. Products that successfully meet the criteria also receive a "Quality-Plus!" designation from NAPF.