I don't know what the EPA calls it; I was working from the dictionary definitions of the words. "Purified" shouldn't apply to water that isn't pure.
which definition has legal weight? its the only definition that matters
seems a lot of adcopy drops the key word
Microbiological Pesticide Registration Manual: Chapter 4 - Additional Considerations for Antimicrobial Products | Pesticide Registration | US EPA
Microbiological water purifier – Any unit, water treatment product or system that removes, kills or inactivates all types of disease-causing microorganisms from the water, including bacteria, viruses and protozoan cysts, so as to render the treated water safe for drinking.