'NSF / ANSI 61: Drinking Water System Components - Health Effects' is the legally recognized national standard in the US for the human health effects of drinking water contact materials, components and devices.
However, the reality is that virtually any material has the potential to leach contaminants into drinking water; the question is whether the type and quantity of contaminants are safe for drinking. There is no ranking system of good, better and best, and the decision is not made wholly based on material type, but based on the finished product.
This document discusses the considerations and testing process behind products of different materials achieving NSF / ANSI 61 certification.
It also contains an NSF Marks Guide for inspectors, regulators and code officials.
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