Historical
NSF/ANSI 401-2022
Drinking Water Treatment Units - Emerging Compounds / Incidental Contaminants
The point-of-use (POU) and point-of-entry (POE) systems addressed by this standard are designed to be used for the reduction of specific substances that may be present in drinking water (public or private), considered to be microbiologically safe, and of known quality. Systems covered under this standard are intended to reduce substances that are at very low, yet measurable concentrations, but not at definitive concentrations of known health concern.
NSF International [nsf]