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Which are the requirements for the water supply on board of a commercial airplane? I know that there are minumum mandatory requirements, but I don't know where to find them and how they can change with the category of the aircraft. Surely there are different requirements from a small turboprop without a toilet to a A320.

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    $\begingroup$ On board what? A private helicopter? A small prop plane? A huge passenger jet? A short domestic flight? A long intercontinental flight? A military fighter over enemy territory? $\endgroup$ – J. Hougaard Dec 10 '16 at 9:24
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    $\begingroup$ It looks like it's complicated, at least in the US: three different agencies are involved, and only one of them is aviation-related. $\endgroup$ – Pondlife Dec 10 '16 at 19:02
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The IATA standards as per the IATA Drinking Water Quality Pool are based on

ISO 17775, WHO requirements or EU/98/83/EC or those set by the civil aviation authorities of the participating airlines

Source

Airlines and operators will periodically test their water in aircraft, ground service vehicles, and filling stations for bacteria contamination (E-coli, coliform, etc).

Some aircraft may not actually have potable water tanks or may have removed them. Horizon Air operates their Q400 Dash 8 aircraft without potable water.

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