To reduce the procurement of third-party tap water, Yang Ming's vessels are equipped with freshwater generators. These units utilize the cylinder jacket cooling water of the vessel's engine as a heat source to evaporate seawater through vacuum distillation and then condense it into distilled water. The operation of the freshwater generator also removes heat from the cooling water, thereby enhancing engine cooling. The fresh water produced is primarily used for boilers and domestic purposes. Crew drinking water is mainly bunkered at terminals during port calls; no water is withdrawn from water-stressed areas.

Shipboard water consumption is categorized into machinery equipment use and consumption by personnel in accommodation areas. Due to the lack of measurement devices, discharge volumes are not statistically recorded. The Company's management measures are as follows: Bilge water from the engine room is treated using oil-water separators that comply with International Maritime Organization (IMO) and MARPOL regulations. Furthermore, Yang Ming adopts coastal and port environmental protection policies that exceed convention requirements, performing legal operations at distances greater than 15/25 nautical miles from shore. Discharge into the sea is permitted only when meeting criteria for ship speed, oil concentration below 15 ppm, and outside Antarctic regions. Grey water includes drainage from dishwashing, showers, laundry, and washbasins. Although MARPOL currently does not regulate grey water treatment, Yang Ming goes beyond regulatory requirements by installing grey water storage tanks. All future newly built vessels will be equipped with grey water storage tanks, and currently, vessels do not discharge grey water within 15/25 nautical miles of the shore, storing it in on-board tanks instead.