| Summary: | This article presents the water management on board Disney Cruise Line (DCL) company ships and it is the last one of the series dedicated to DCL waste management. In the previous papers, we focused on the environmental policies of the DCL company, on cruise itinerary waste management plans, and waste collection, sorting, storage and management on board DCL ships. This paper is based on the analysis of the ships’ environmental personnel’s activity, including recorded data and field observations, and of the company's internal regulations. The paper features an in-depth presentation of wastewater (gray and black water) management on board DCL cruise ships. The water is collected in special tanks, processed by an advanced wastewater purification system (AWPS), and discharged under strict control. A Wastewater (gray and black water) Log is kept on board DCL ships by the Chief Engineer. The paper also describes the White Box system used for controlling and monitoring the bilge water discharge from the vessel, and the ships’ drinking water system and management. Finally, the study analyses the water management in recreational facilities, as well as ballast water management. The study concludes that the DCL company is committed to minimizing its fleet’s environmental impact by green and appropriate water management procedures. The AWPS, using biological degradation, inverse osmosis and UV sterilization, results in the discharge of high-quality water, which does not require any further processing that could involve chemicals that are dangerous for the marine environment. Drinking water is brought on board DCL ships via land-based supply points and must be collected from potable sources that meet the World Health Organization standards for drinking water. Proper water management in the recreational facilities and ballast water management represent an essential part of maintaining the public and environmental health standards needed to prevent pathogen contamination, the absorption and release of harmful aquatic organisms and endangering marine sanctuaries, reservations, parks, and coral reefs. DCL has an environmentally-friendly vision and is fully committed to environmental protection.
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