***Update: This standard has been revised. NSF/ANSI 53-2019: Drinking Water Treatment Units – Health Effects is available on the ANSI Webstore. You can read more about its changes in our post NSF/ANSI 53-2019: Drinking Water Treatment Units – Health Effects.
The effective delivery of clean water is a matter of public health, and it is carried out with the aid of reliable components and careful processes. Among these, one of the most crucial is the treatment of drinking water.
NSF/ANSI 53-2017: Drinking Water Treatment Units—Health Effects establishes minimum guidelines for materials, design and construction, and performance of point-of-use and point-of-entry drinking water systems designed to reduce specific health-related contaminants in public or private water supplies. These systems can be used to treat all or part of the portable water at the inlet to a residential facility or a bottled water production facility, and the standard includes the materials and components of these systems.
Ultimately, the systems addressed by the NSF/ANSI 53-2017 standard are meant to reduce specific substances that may be present in public or private drinking water and are considered established or potential health hazards. This includes those that are microbiological, chemical, or particulate in nature.
NSF/ANSI 53-2017 revises and supersedes the 2016 edition of the same standard, which you can learn more about in our past post: NSF/ANSI 53-2016 – Drinking Water Treatment Units – Health Effects. In addition to updated normative references, NSF/ANSI 53-2017 contains the following changes:
- Sample collection for systems containing multiple potable water outlets under 4.2.3. “Exposure” are now addressed.
- Evaluation criteria columns from Tables 4.1 – “Extraction testing parameters (metals),” 4.2 – “Extraction testing parameters (semi-volatiles),” and 4.3 – “Extraction testing parameters (volatiles)” were removed and now reference the evaluation criteria in Annex D Table D.1 in NSF/ANSI 61.
- Performance guidelines for drinking water treatment systems designed to reduce microcystins in public water supplies are now addressed in the standard.
- New normative Annex J “Preparation of TOC solution using tannic acid.”
- New informative Annex K “Explanation of scope and purpose of microcystins reduction claim.”
NSF/ANSI 53-2017, designated an American National Standard, was written and published by NSF International, an ANSI-accredited standards developing organization. NSF International standards address the underlying considerations for public health, allowing manufacturers, regulators, and consumers to help protect the world’s food, water, consumer products, and environment.
If you are interested in related NSF International standards for water treatment, please refer to our post on 2017 NSF/ANSI Water Treatment and Component Standards.