Cruises will have a plumber on board to make sure everything is running smoothly. Plumbing on a cruise ship can be a logistical nightmare because, should there be a problem, people are stuck without water on a vacation they potentially paid a lot for and they are on a ship in the middle of an ocean.

Yes, cruise ships maintain a highly skilled team of specialized plumbers as part of their technical engineering department. In 2026, managing a ship's plumbing is far more complex than on land because most vessels utilize a vacuum-drainage system rather than a gravity-fed one. This system relies on a constant vacuum to pull waste through narrow pipes to the onboard treatment plant. Cruise ship plumbers (often called "Plumbing Fitters") are responsible for clearing blockages—frequently caused by guests flushing prohibited items like wet wipes or feminine products—which can shut down the toilets for an entire section of the ship. They also manage the desalination and filtration systems that turn seawater into potable drinking water and maintain the massive complex of greywater and blackwater tanks. Given that a modern ship can house over 6,000 people, the plumbing team works 24/7 on a rotating "on-call" basis to ensure that water pressure is maintained and that environmental regulations regarding waste disposal are strictly followed while at sea.