Domestic and potable water systems must be designed and maintained according to the rules for classification and construction of seagoing ships stated by the relevant
classification societies regulations (for instance LR, ABS, DNV GL, BV etc.), ISO and Nationals standards.

Methods of receiving and storaging of freshwater influents on its sanitary and bacteriological properties. The properties of potable water regulates by WHO and National sanitary regulations.

Drinking water can spread a number of serious diseases. Therefore, a number of special requirements are imposed on water quality. Drinking water which loaded on shipboard must be fresh, clear, without smell, non-harmful in chemical content and does not contain pathogens. The quality of the water shall comply with a quality standard specified by the receiving country or port. For instance, in the European Union the quality of the water shall comply with the Directive 98/83/EC.

International Labour Organization (ILO) Convention C133 defines minimum standards for provision of potable water for crews.

The Maritime Labour Convention (MLC), 2006 provides comprehensive rights and protections at work for seafarers. Regulation 3.2 of the MLC, 2006 includes requirements for drinking-water on board.

In the IMO's Life-Saving Appliance Code (LSA Code), additional information about potable water requirements in rescue boats is provided.