At cruising height, even the smallest detail can be the difference between heaven and earth. The comfort of a drink for a parched throat, a cup of hot tea, a visit to the loo to refresh oneself; each one of these and many such is made possible by the functioning of a single background system, and that is the aircraft water supply system. Quite naturally, for an average passenger, the water that comes out of the plane is something that can be sipped with the same eagerness and without the same apprehensions as when one draws water from a faucet at home.As the world witnesses an increase in global air travel, the concerns regarding hygiene become an important part of discussions on global issues related to health. International aviation health guidance, including standards outlined by the World Health Organisation, treats aircraft water not as a convenience but as a system requiring careful oversight to protect passengers and crew alike.
How plane water is loaded, stored and reused
In contrast to building water systems, an airport’s aircraft have no constant supply of water. Every aircraft relies upon water loaded into the aircraft shortly before departure, quite possibly at various airports throughout a round-trip journey. Though the airport’s water supply may be safe at the point of origin, keeping the quality of such water in a conserved state is an extremely regulated process.
- Water is supplied either from municipal water sources or from treatment plants run by the airport that comply with the standard set by the municipality for drinking water.
- It is then conveyed to aeroplanes via water points using trucks or water hoses.
- Such transfer systems should be kept isolated from the wastewater equipment in order to ensure there is no cross-contamination.
- After boarding, the water is stored internally in holding tanks that supply water to the galley and lavatories.
- Water can remain in these tanks for a number of flights if only topped up and not fully replaced.
As the process comprises various handling phases with mobile machines, the quality and integrity of aircraft water depend as much on procedures and maintenance as on the original source itself.
The hidden risks with aircraft water systems
Scientific interest in aeroplane water is primarily related to microbiological safety. Unlike chemicals, where toxicity problems are normally associated with long periods of exposure, bacterial infections can render people ill after brief contact.
- Worldwide studies have shown the presence of indicator bacteria such as total coliforms in aircraft water samples.
- The presence of Escherichia coli is a rare indicator of faecal contamination.
- Microorganisms may survive or reproduce in plumbing systems on board the aircraft, especially if the water is stagnant.
- When contamination occurs, this is typically a local problem, with specific taps being affected and not a particular system.
Low residual levels of disinfectant can result in the development of a biofilm inside pipes and storage tanks.Although there have been few reported instances of illness directly traceable to aircraft tap water quality, these results indicate a potential susceptibility that would not be suggested were the water proven safe.
How passengers come into contact with plane water
Aircraft water is in constant use throughout a flight, even among passengers who never consume it as a beverage. Increased contact with water means the need to understand its relation to health concerns.
- Hand washing, washing faces, and brushing teeth are done with lavatory sinks.
- Water is used for preparing hot beverages and rehydrating some food.
- The crew uses water from the galley area for cleaning utensils and surfaces.
- Passengers may inadvertently consume small quantities during hygiene practices.
For external uses like washing hands with soap, rinsing the mouth during brushing, or washing the face, water on a plane may be considered lower risk compared to consumption. However, these uses become risky when the water is swallowed. For example, water on an aeroplane can be mixed with baby formula to feed babies, but it is not recommended to drink it directly from the tap.The amount of water available is also an important factor. If water is not available in sufficient amounts, this can diminish proper hand hygiene and cleanliness for passengers.
Simple ways to use plane water more safely
Passengers themselves are not responsible for managing aeroplane water systems; yet, some small, well-informed decisions can help avoid excessive risks of being exposed unnecessarily while ensuring flight comfort and hygiene.
- Prefer sealed bottled water when available for drinking purposes.
- It’s recommended to use bottled water to brush your teeth, especially if you don’t want to ingest anything.
- Hand-washing with soap and water is still in place as appropriate and effective.
- Try not to swallow tap water when rinsing your mouth or washing your face.
- Favour fresh hot beverages prepared at a high temperature.
- Carry alcohol-based hand sanitiser in case soap and water are not available.
These measures are consistent with airline hygiene procedures and enable passengers to weigh their practicality against caution in recognition that water is an essential system on board that is designed for multiple uses, not all of equal potential risks.Also Read | How Kandovan’s rock-cut village in Iran still functions as a living settlement
