ISO 15859-10:2004 specifies limits for the composition of water and establishes the sampling and test requirements applicable for the verification of the water composition.

ISO 15859-10:2004 is applicable to only potable water and high-purity demineralized or deionized water, used for cooling and servicing of space systems as well as both flight hardware and ground servicing, system, and equipment, of Type HP (high purity) and Type P [potable (drinking)].

It is not applicable to other types of water that may be provided to a space system. ISO 15859-10:2004 is applicable to influents only within the specified limits herein.

ISO 15859-10:2004 is applicable to any sampling operation required to ensure that, when the fluid enters the launch vehicle or spacecraft, the fluid composition complies with the limits provided hereafter or with any technical specification agreed to for a particular use.