http://ec.europa.eu/environment/water/water-drink/legislation_en.html
ref - https://www.reddit.com/r/europe/comments/958uyz/til_that_according_to_eulevel_rules_all_drinking/
origin - https://www.pipiscrew.com/2018/08/according-to-eu-level-rules-all-drinking-water-in-the-eu-should/ according-to-eu-level-rules-all-drinking-water-in-the-eu-should