Distinguish NSF/ANSI 61 and NSF/ANSI/CAN 600 requirements when specifying a coating for potable-water contact

Steps

1. Confirm NSF/ANSI 61 remains the primary standard establishing health-effects requirements for drinking-water system components generally, including tank linings/coatings
2. Confirm NSF/ANSI/CAN 600, 'Health Effects Evaluation and Criteria for Chemicals in Drinking Water,' is a companion reference standard NSF adopted (effective implementation January 2023) that imposes materially lower solvent-extractable limits (e.g., for toluene, ethylbenzene, xylene) than were previously required
3. When evaluating a coating product, check NSF's own product listing (info.nsf.org or the product's NSF certification listing) to confirm which standard(s) — 61 alone, or 61 plus 600 — the specific product is currently certified against, since not all legacy NSF 61-listed products have been recertified to the newer 600 solvent-extraction criteria
4. Note the additional PFAS testing requirement NSF has layered into this space with a stated compliance deadline in the 2028 timeframe, and confirm current status directly on nsf.org rather than from a manufacturer's marketing claim
5. Match the certification requirement to the specific water authority's or specification's stated requirement (some now explicitly require NSF 61 + 600, others still cite NSF 61 alone)