NSF/ANSI Standard 60 — Drinking Water Treatment Chemicals — Health Effects is the benchmark certification for chemicals used in the treatment of water intended for human consumption. Administered by NSF International, the standard evaluates whether a water treatment chemical, at its maximum recommended dose, contributes contaminants to treated water at levels that pose a risk to human health. In many jurisdictions, NSF 60 certification is legally required for chemicals used in potable water treatment.
The certification process involves rigorous toxicological evaluation and analytical testing. The manufacturer submits product formulations, raw material sources, and manufacturing processes for review. NSF calculates the maximum allowable level (MAL) of each contaminant that could leach into drinking water at the product's maximum use level. These MALs are derived from EPA MCLs (Maximum Contaminant Levels), WHO guidelines, and other regulatory limits, typically using a 10% allocation factor.
For coagulants like ferric chloride and PAC, NSF 60 testing focuses on heavy metal impurities (arsenic, lead, mercury, cadmium, chromium), unreacted monomers (in polymer products), and process contaminants. Products must be retested annually, and any change in formulation, raw material source, or manufacturing process triggers re-evaluation. The certification also requires annual factory audits to verify quality control procedures.
From a procurement perspective, specifying NSF 60-certified products provides several benefits: regulatory compliance assurance, reduced liability risk, documented product safety, consistent quality through annual audits, and simplified approval processes with health authorities. For export markets — particularly Europe, Australia, and the Gulf states — NSF 60 certification is increasingly recognized as equivalent to or exceeding local certification requirements, facilitating market access.