According to an anonymous cabin crew member, travellers should not brush their teeth in a plane bathroom, using the water. The water on a plane all comes from the same water tank and it is not filtered, they told UK company, Sanctuary Bathrooms.
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Why is it bad for you? Airplane tap water is stored in on-board tanks that house the liquid for tea, coffee, and to service the restrooms. These tanks are often stored without cleaning for long periods at a time, leading to the potential build-up of bacteria in the stagnating water.
However, every other country in Europe on the top 20 list is fine, meaning not only can you drink the tap water there, but you can use it to brush your teeth and have ice cubes in your drinks too.
To be extra safe, the CUNY researchers advised people never to drink water onboard a plane that does not come from a sealed bottle. They also said passengers should not drink coffee or tea brewed on their flight, and that they should even use hand sanitizer instead of washing their hands with onboard water.
An airplane bathroom does not use the water like a regular bathroom. Instead, it uses a vacuum system, and when it flushes it moves into a septic tank that is on the airplane. The pipes used are much smaller than regular plumbing pipes and they can be placed in any direction since they do not use gravity and water.
The two airlines that feature onboard showers are Emirates and Etihad, both carriers from the United Arab Emirates. Showers are found solely on their Airbus A380 aircraft. They are reserved for passengers travelling in First Class (on both Emirates and Etihad) and The Residence (on Etihad only).
Greywater is typically ejected from the plane while in flight via drain mast. This is an external vertical winglet on the airplane that is heated to prevent the water from freezing. The ejected water typically evaporates within the atmosphere.
Most of the sink water drains lead to an outlet port near the tail of the plane and the water evaporates mid-air if the plane is flying, while for some fleet types a very small amount is captured in separate containers on board. A lavatory Service Cart is used to drain the waste from the aircraft waste tank.