Drinking water and drinking water supply on board ships must comply with the requirements in Regulation of 22 December 2016 no. 1868 on water supply and drinking water (the drinking water regulation).
In addition, section 46 in Regulation of 21 April 2017 no. 515 on accommodation, recreational facilities, food and catering, must be complied with.
The Norwegian Food Safety Authority is responsible for the regulation on water supply and drinking water. They have made a guideline for drinking water on ships (in Norwegian).
Questions regarding Regulation of 22 December 2016 no. 1868 on water supply and drinking water (the drinking water regulation) must be directed to the Norwegian Food Safety Authority, while questions related to Regulation of 21 April 2017 no. 515 on accommodation, recreational facilities, food and catering can be directed to the Norwegian Maritime Authority.