The next time you’re flying, you may want to think twice about requesting for hot beverages or even washing your hands in the plane’s washroom. Drinking water provided on airplanes may be dirtier than you think, according to results from the 2019 Airline Water Study.

Non-profit organisation DietDetective.com and Hunter College New York City Food Policy Center studied and scored the quality of water onboard 23 airlines in the United States — 11 major and 12 regional airlines — and ranked them. Airlines outside of the US were not included in the research.

Water stored in the airplane’s water tanks for flights generally have a couple of uses: to make hot coffee and tea in the galley, and in the lavatories. Now you know why there are signs in the loo warning you not to drink the water from the sink.

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