What do cruise ships use for drinking water?

Most cruise ship water is desalinated sea water. The process usually involves steam evaporation -- essentially turning saltwater into distilled water. That water is then mineralized for flavor and chlorinated for extra safety. Other ships are fitted with a reverse-osmosis system for filtering and/or desalination.



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Water used for drinking is usually taken from seawater undergoing a desalination process. River cruise ships have smaller water stores. Fresh water supplies are topped up during each port visit, which isn't a huge problem since their travels don't run several days between port visits.

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Cruise ship tap water is safe to drink unless you are told otherwise by the ship's authorities. The water throughout the ship has been treated, filtered and frequently tested to meet the standards of the World Health Organization and the U.S. Public Health Service on ships sailing into and out of U.S. ports of call.

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Do Cruise Ships Dump Sewage? Yes. To get into a few more specifics than above, the U.S. allows cruise ships to dump treated waste into the ocean if they are within three and a half miles from shore. Beyond that point, there are no restrictions for dumping untreated, raw sewage in U.S. ocean waters.

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Cruise ship pools are usually filled with saltwater which has been chemically treated. On some cruise ships, you will find freshwater pools but these are less common. It is possible to have a cruise ship where some pools are fresh and some saltwater, this is very common on Royal Caribbean cruise ships.

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Since the drinking water on cruise ships is safe to drink, refillable water bottles and drinking cups are the ideal way to stay hydrated, both onboard and in ports. Note that, for hygiene reasons, some cruise lines ask that passengers not fill up personal water bottles directly from water dispensers in the buffet.

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Many cruise lines let you bring water onto a cruise with you, but not all do. Some block it completely except for if you need distilled water for medicinal purposes, while some others won't let you bring single-use plastic bottles onboard, but permit cans and cartons which can be recycled.

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All of that waste is either processed via biodigesters or dehydrators, or offloaded on shore. Some of the company's ships have long had dehydrators, which squeeze the water from food waste and lighten the load that can be taken to landfills, compost sites or waste-to-energy facilities.

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When a toilet is flushed on a cruise ship, the sewage travels to the onboard treatment plant. Here the waste is filtered before it enters an aeration chamber. The aeration chamber cleans the waste. It is then sterilized using UV light and released into the ocean when clean enough to do so.

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Cruise lines drain their swimming pools at night to discourage guests from trying to enter the pool when it is closed. Draining the swimming pools each night also allows the cruise lines to replace the water with clean water and a drained swimming pool is safer if the weather is rough.

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These stations offer a variety of sodas, lemonade, hot cocoa, tea, coffee, milk, and water. All of these beverages are included in your cruise fare. Please fill a fresh cup with water and then pour it into your personal water bottle when using the beverage stations to refill a water bottle.

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Carnival Cruise Line: Carnival has one of the loosest beverage policies of all cruise lines, allowing each guest to carry on a maximum of 12 sealed 12 oz. cans or cartons of a non-alcoholic beverage (e.g., sodas, juices, milk, or sparkling water) – a policy that most cruise lines have eliminated.

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Can you bring snacks, like candy, on a cruise? Shelf-stable snacks like chips, pretzels, protein bars or any other items packaged in sealed wrappers are permitted on every major cruise line.

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Tap water on cruise ships is safe to drink. Guests can drink tap water either from the tap in their cabin bathroom or at dinner when it is offered. The water has been through a purification system and though it may not taste the best on all cruise ships, it's safe to drink.

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And while some other items in the video also seem fairly obvious, two things that are flushable at home can't be flushed on cruise ships -- wipes and non-cruise-ship toilet paper.

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There are some exceptions to this rule but generally speaking, the majority of cruise lines drain their swimming pools each night. They do this for multiple reasons.

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The pools are small due to Free Surface Effect. The more room water has to slosh back and forth, the more unstable the ship becomes. The fact that the pools are typically on the highest deck only furthers the need for them to be small.

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