Hi! "In French for example "potable" means "drinkable (without problems)"" Always in different languages will be different meaning hence the problem with tagging.
"Which law is that? And in which language? " How do you know that drinking water flows from your tap? The question is for e.g WHO http://www.who.int/water_sanitation_health/water-quality/en/ http://ec.europa.eu/environment/water/water-drink/ ect:. every country has its own sanitary regulations. sorry to accidentally refresh the question from 2012. with Regards Slavo
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