evidence: This is according to a commentary published in the journal BMJ Global Health. According to researchers from Weill Cornell Medicine in Qatar, bottled water in the US is often not subject to the same rigorous quality and safety checks as tap water, meaning it can carry more harmful chemicals leaching in from the plastic bottles. [...] "The reliance on bottled water incurs significant health, financial and environmental costs, calling for an urgent re-evaluation of its widespread use." [...] Some studies have also estimated that up to two-thirds of bottled water in the US is repackaged tap water.