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  • Open What is Annex G?

    NSF/ANSI Standard 61 was revised in December 2008 to establish requirements for use when a 0.25% lead content requirement needs to be met in addition to current chemical extraction requirements of the standard. The requirements were placed in Annex G - Weighted Average Lead Content Evaluation Procedure to a 0.25% Lead Requirement. In addition, mandatory language placing restrictions on the use of lead as an intentional additive in water contact materials was also added to Section 3. To view the full content of the annex as adopted in NSF/ANSI 61 - 2008, download the PDF document.

    A request was made to add these requirements to the standard to allow manufacturers the option of being certified to a lead content standard, such as California’s Health & Safety Code (Section 116875) commonly known as AB1953. That law, which goes into effect January 1, 2010, applies to any pipe, pipe of plumbing fitting, or fixture intended to convey or dispense water for human consumption through drinking or cooking. A similar law has been enacted in Vermont and is also to take effect January 1, 2010.

    The annex was developed through the Lead Task Group of the Drinking Water Additives Joint Committee and includes requirements that enable conservative and consistent application of the lead content evaluation procedure. Highlights include:

    • The annex contains <0.25% weighted average lead content requirements. Compliance is determined by a weighted average calculation involving the maximum percent lead content of material specifications and wetted surface areas.
    • Does not consider coatings or acid washing. Compliance is determined by the maximum percent lead content of material specification for each component prior to application of any coatings or lead wash treatments. Documents including an opinion from East Bay Municipal District and statement of legislative intent were provided to the Lead Task Group during development of the annex.
    • For internally threaded products, the wetted surface area includes 25 percent of the threaded area(s). This is consistent with the assumptions used in the rest of Standard 61.
    • Annex G did not contain a verification test protocol when it was first developed. The California Department of Toxic Substance Control subsequently developed test protocols for the determination of lead content and these were incorporated into NSF 372.
    • Annex G is an optional annex under NSF/ANSI 61. Certifications to Annex G note compliance within the NSF/ANSI 61 or NSF/ANSI 14 listing.
    • The annex requires full compliance with NSF/ANSI 61.
    • The annex does not specifically reference California and applies to any jurisdiction with a ≤0.25% weighted average lead content requirement.


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