The health effects of water are of prime importance. Chemicals make water potable, letting it safely enter our bodies to keep our temperature regular, lubricate joints, protect our spinal cord, and expel waste. In doing this, they, of course, cannot contribute to any adverse effects. NSF/ANSI/CAN 60-2019: Drinking Water Treatment Chemicals – Health Effects establishes minimum health effects for chemicals, chemical contaminants, and impurities added directly to drinking water from treatment chemicals.
Chemicals Covered by NSF/ANSI/CAN 60-2019
NSF/ANSI/CAN 60-2019 covers coagulation and flocculation, softening, precipitation, sequestering, pH adjustment, corrosion/scale, and disinfection and oxidation chemicals, as well as miscellaneous treatment and water supply chemicals.
The standard is not applicable to products resulting in the intentional introduction of microorganisms to treat drinking water. NSF/ANSI/CAN 60-2019 also doesn’t cover contaminants produced as byproducts through reaction of treatment chemicals with a constituent.
Changes to NSF/ANSI/CAN 60-2019
In the 1980s, in response to a competitive request for proposals from the U.S. Environmental Protection Agency (EPA), a consortium led by ANSI-accredited standards developing organization NSF International agreed to develop voluntary third-party consensus standards and a certification program for all direct and indirect water additives. In 1988, these efforts culminated in the initial publication of NSF 60 and NSF 61.
Today, NSF/ANSI/CAN 60, as it is now designated, is revised periodically to remain current. NSF/ANSI/CAN 60-2019 revises the 2018 edition of the same American National Standard. When compared to the previous edition, it contains the following changes:
- The typical use level (TUL) for sodium silicate was raised from 16 mg/L to 100 mg/L, and synonyms for sodium silicate were corrected
- The use and fate of chlorate & chlorite in drinking water was clarified
- New guidance was provided in Annex N-1 on conducting the potassium-40 correction method for radionucleotide analysis, and this language also standardizes the threshold for conducting gross beta particle speciation
- Remineralization was added to the scope of the processes covered by drinking water treatment chemicals
- They typical use level (TUL) for fluoride products was lowered from 1.2 mg/L to 1.0 mg/L
- Annex names were changed from alpha characters to numeric and preceded by “Normative” or “Informative,” e.g. “Annex A” is now “Informative Annex 1 (N-1)”
NSF/ANSI/CAN 60-2019: Drinking Water Treatment Chemicals – Health Effects is available on the ANSI Webstore.
We hold this liquid molecule in high esteem, and rightfully so—human beings require a gallon of water every day to perform basic functions, as well as some other sources here and there to cook and conduct various hygiene-related tasks. As such, there are numerous standards devoted to water.
While NSF/ANSI/CAN 60-2019 deals with the health effects of chemicals directly imparted to drinking water systems, NSF/ANSI/CAN 61-2019 establishes the health effects from drinking water system components.
This standard applies to products like process media, protective materials, joining and sealing materials, pipes, mechanical devices used in treatment systems, and mechanical plumbing systems.
You can learn more about this standard in our post NSF/ANSI 61-2019 – Drinking Water Components Health Effects. We also outlined the changes made to the current edition of this American National Standard in our post NSF 61-2019 Changes: Drinking Water System Components.
Some drinking water standards even come with companion standards to sufficiently organize guidance pertinent to their compliance. The companion standard to NSF/ANSI 60 and NSF/ANSI 61, NSF/ANSI/CAN 600, focuses on the “Health Effects Evaluation and Criteria for Chemicals in Drinking Water.” This information is referenced in section 3.4 of NSF/ANSI/CAN 60-2019, which details contaminant concentrations.
NSF/ANSI/CAN 61-2019: Drinking Water System Components – Health Effects and NSF/ANSI/CAN 60-2018: Drinking Water Treatment Chemicals – Health Effects come with a complementary copy of NSF/ANSI/CAN 600 on the ANSI Webstore.
You can learn more about NSF/ANSI/CAN 600 in our post Companion Standard to NSF/ANSI 61 & 60 for Drinking Water.