A flight attendant has shared their key piece of advice for both long and short-haul flights, revealing that not following this tip can make you ill. Leading travel expert Ski Vertigo and a flight attendant have advised passengers against drinking tap water on planes - adding that even tea and coffee have been known to harbour dangerous bacteria. While this might not be the case with the majority of flights, the travel experts said: "Airplane water tanks are often not adequately cleaned, leading to potential contamination.

Research and reports indicate that the water in these tanks can harbour harmful bacteria and pathogens. READ MORE: ‘Prettiest’ UK village that was once the setting of a brutal witch trial "The Environmental Protection Agency (EPA) has found that a significant percentage of aircraft tested positive for coliform bacteria, and even E. coli in some cases.

These bacteria can cause serious gastrointestinal issues and other infections." They added cleaning schedules for aeroplane water tanks can be irregular, which can lead to a build-up of bacteria and microorganisms. These in turn make the tank much harder to clean.

The problems with tap water have also led to experts advising against ordering tea or coffee when onboard a plane. They said: "The coffee and tea served on flights are often made using the plane's tap water, which means that any contamination in the water tanks is also present in these beverages. "Flight attendants have reported that the equipmen.