NSF 401-2017a

1.1 Purpose

It is the purpose of this Standard to establish minimum requirements for materials, design and
construction, and performance of drinking water treatment systems that are designed to reduce specific
emerging compounds/incidental contaminants in public or private water supplies, such as pharmaceutical,
personal care products, and endocrine disrupting compounds. This Standard also specifies the minimum
product literature and labeling information that a manufacturer shall supply to authorized representatives
and system owners as well as the minimum service-related obligations that the manufacturer shall extend
to system owners.

1.2 Scope

The point-of-use and point-of-entry systems addressed by this Standard are designed to be used for the
reduction of specific substances that may be present in drinking water (public or private) considered to be
microbiologically safe and of known quality. Systems covered under this Standard are intended to reduce
substances that are at very low, yet measurable concentrations but not at definitive concentrations of
known health concern. These substances may be soluble or particulate in nature but their presence, even
at very low concentrations, may influence public acceptance/perception of the drinking water quality. The
systems addressed by this Standard are not intended for reducing these specific substances at higher
concentrations that may have a known acute or chronic health effect. It is recognized that a system may
be effective in reducing one or more of the emerging compounds/incidental contaminants listed in this
Standard. It is not necessary that a device be able to reduce all the emerging compounds/incidental
contaminants listed in order to meet the requirements of this Standard. Systems with components or
functions covered under other NSF or NSF/ANSI standards or criteria shall conform to the applicable
requirements therein.