Water is important. It makes up 60% of your body and 71% of your planet. In fact, in the over-dozen times we’ve focused on drinking water standards in this blog, their purpose has been clear: drinking water needs to be safe for consumption to support public health. Aiding the performance of treatment units that minimize the health effects of drinking water, NSF/ANSI 53-2019: Drinking Water Treatment Units – Health Effects outlines various requirements.
American National Standard for Drinking Water Treatment Units
Specifically, NSF/ANSI 53-2019 establishes minimum requirements for materials, design and construction, and performance of drinking water treatment systems designed to reduce specific health-related contaminants in public or private water supplies. These systems, point-of-use (POU) and point-of-entry (POE), reduce substances considered established or potential health hazards, whether chemical or particulate (including filterable cysts) in nature. The standard also includes product literature and labeling information.
Changes to NSF/ANSI 53-2019
Compared to the previous edition released in 2018, NSF/ANSI 53-2019 has undergone the following changes of note:
- A performance reduction claim was added for perfluorocctanoic acid (PFOA) and perfluoroctane sulfonate (PFOS) for nonregenerable drinking water treatment devices that use anion exchange media. This is found in new section 7.2.6, “Nonregenerating PFOA/PFOS reduction testing.”
- The pass/fail criteria for lead reduction (Tables 7.10 and 8.1) was changed from 10 μg/L to 5 μg/L. This alteration reflects current proposals at the state, federal, and international levels.
- A previous error in Table 5.1, “Structural integrity testing requirements,” was corrected, adding a heading for “Complete systems” and “Components.”
- Keeping in line with editorial changes to made to many NSF standards published in 2019, the annexes were changed from alpha characters to numeric and are now preceded by “Normative” or “Informative.” For example, “Annex A” from NSF/ANSI 53-2018 is called “Normative Annex 1 (N-1)” in NSF/ANSI 53-2019.
NSF/ANSI 53-2019: Drinking Water Treatment Units – Health Effects is available on the ANSI Webstore.
Past Revisions of NSF/ANSI 53
Due to the sheer importance of drinking water, this American National Standard developed by NSF International is published annually. If you need any past editions of ANSI 53, you can find them as historical standards on the ANSI Webstore. You can also read about the many changes made to past revisions here: