potable water on board trains vessels aircraft and buses regulations 25 pages available in english and french . there are potential public health risks to travellers associated with water supplied on board conveyances. the 1954 empotable water regulations for common carriers em pwrcc are federal regulations that aim to manage these risks. the pwrcc include provisions related to water disinfection water quality and vessel construction that no longer reflect the latest industry or scientific standards. consequently new regulations with modernized requirements are being proposed to hel ensure the continued protection of the travelling public in canada. the objective of the proposed empotable water on board trains vessels aircraft and buses regulations em the proposed regulations is to protect the public by managing risks associated with water supplied to passengers travelling on conveyances. the proposed regulations retain and clarify the key provisions of the pwrcc while providing updated requirements for water served to passengers. the proposed regulations would require conveyance operators to ensure that water and ice are provided in sufficient quantity for passenger needs and for food preparation on board. water and ice could be supplied from a potable water system or as bottled water and prepackaged ice. conveyance operators would need to ensure that bottled water and prepackaged ice meet the requirements set out in the emfood and drug regulations em currently division 12 of part b made pursuant to the emfood and drugs act em. the proposed regulations specify that potable water systems would need to be designed constructed and operated to prevent the risk of contamination by preventing backflow protecting filling connections and cross connections and protecting the system from tampering. the proposed regulations also specify that components of potable water systems must be clearly labelled. these fundamental design and operating measures aim to prevent potable water from mixing with non-potable water or wastewater which could contaminate the potable water supply and lead to water-borne illness.