Yes, you can drink tap water on most cruise ships, but the source and safety vary by cruise line and ship age
The tap water on cruise ships operated by major lines — Carnival, Royal Caribbean, Disney, Norwegian, and others — is treated and safe to drink. Most modern ships have their own water treatment systems that meet or exceed U.S. Environmental Protection Agency standards. The water comes from either the ship's desalination plants, which convert seawater to fresh water, or from ports where the ship refills its tanks.
However, water quality can differ between older and newer vessels, and between different cruise lines. Some passengers report that tap water tastes different from what they are used to at home — often because of the minerals added during desalination or the chlorine used to treat it. This taste difference does not mean the water is unsafe, but it may prompt you to bring bottled water or buy it onboard if you prefer.
The safest assumption is that tap water in your cabin and at public fountains is drinkable on any major cruise line. Water in the engine room, laundry areas, and certain deck areas is not potable and is clearly marked. If you have a compromised immune system or are traveling with very young children, ask your cabin steward or guest services whether the ship's water system has been recently tested.
Key Takeaways
- Tap water in your cabin and at public water fountains on major cruise ships is treated and safe to drink under normal circumstances.
- Water taste may differ from home because cruise ships use desalination or add minerals and chlorine, but this does not indicate unsafe water.
- Bottled water is available for purchase onboard, though it costs more than buying it before you board.
- Older ships or those operated by smaller cruise lines may have different water standards, so ask guest services if you have concerns.
- Water marked as non-potable in engine rooms, laundry areas, and certain decks should never be consumed.
How cruise ship water systems work
Most modern cruise ships produce fresh water using reverse osmosis desalination, a process that removes salt and minerals from seawater. The ship's system forces seawater through a membrane under pressure, leaving behind salt and impurities while producing fresh water. This water is then treated with chlorine or other disinfectants and stored in large tanks throughout the ship.
Some ships also refill their water tanks at ports, particularly in the Caribbean and Mediterranean. When water comes from a port, it is treated onboard before being distributed to cabins and public areas. The cruise line is responsible for testing this water to may support it meets safety standards before it enters the ship's system.
All major cruise lines are required to follow the Cruise Vessel Security and Safety Act, which includes water quality standards. Ships are inspected regularly, and water samples are tested for bacteria, chemical contaminants, and other hazards. The results of these inspections are public record and can be found on the Centers for Disease Control and Prevention (CDC) website if you want to check a specific ship before you book.
Why tap water tastes different on a ship
Desalinated water often tastes flat or slightly salty because the reverse osmosis process removes not only salt but also minerals like calcium and magnesium that give tap water its familiar taste. Cruise lines add some minerals back in to improve taste and protect the ship's pipes, but the balance is different from municipal water systems on land.
Chlorine used to disinfect the water can also be noticeable, particularly if the ship's system maintains a higher chlorine level than your home water supply. This is a safety measure and does not make the water unsafe — it is the same disinfectant used in most public water systems in the United States.
If the taste bothers you, bringing a water pitcher with a built-in filter or purchasing bottled water onboard are both options. Some passengers also find that letting tap water sit in a glass for a few minutes allows chlorine to dissipate, improving the taste slightly.
Bottled water and other beverage options onboard
Bottled water is sold at the ship's convenience stores, bars, and sometimes at the pool deck. A single bottle typically costs between $2 and $4, depending on the cruise line and bottle size. If you drink several bottles per day, this cost adds up quickly over a week-long cruise.
Many cruise lines offer beverage packages that include bottled water, soft drinks, and alcoholic beverages for a flat daily rate. These packages are often cheaper than buying drinks individually, especially if you plan to drink bottled water throughout your cruise. Some lines also allow you to bring a limited amount of bottled water onboard — typically one or two bottles per person — so check your cruise line's policy before you pack.
Coffee, tea, and juice are provided free at dining venues and buffets. Tap water is also free at any public water fountain or from your cabin tap, making it the most economical choice if you can tolerate the taste.
Water safety in different regions and on different ships
Water quality on cruise ships is most consistent on newer vessels operated by major cruise lines. Ships built in the last 10 to 15 years have more advanced water treatment systems than older ships. If you are booking a cruise on a smaller or older ship, or with a cruise line you are unfamiliar with, asking about the ship's water system during the booking process is reasonable.
Caribbean and Mediterranean cruises generally have reliable water systems because these routes are well-established and heavily regulated. Cruises to more remote regions — such as Alaska, the South Pacific, or parts of Asia — may have less consistent water infrastructure, though major cruise lines maintain their own treatment standards regardless of location.
If you are traveling to a region where you would normally avoid tap water on land, the same caution applies onboard. However, cruise ship water systems are separate from local port water systems, so refilling your bottle at a port does not carry the same risk as drinking local tap water ashore.
What to do if you are concerned about water quality
If you have a weakened immune system, are pregnant, or are traveling with infants, ask your cabin steward or guest services about the ship's most recent water quality test results. Most cruise lines keep this documentation available and can provide it upon request. You can also check the CDC's Vessel Sanitation Program website before your cruise to see inspection reports for your specific ship.
If you notice discolored, cloudy, or foul-smelling water coming from your cabin tap, report it when ready to your cabin steward. This is unusual on modern ships but should be addressed right away. Do not drink the water and ask for bottled water to be brought to your cabin while the issue is investigated.
Bringing a personal water filter or filtration pitcher is also an option if you want extra reassurance. These take up minimal luggage space and can filter tap water to your preferred taste and safety level.
Staying hydrated during your cruise
Cruise ships are dry environments — the salt air and constant air conditioning can dehydrate you faster than you realize. Drinking plenty of water throughout the day is important, especially if you are spending time in the sun or consuming alcohol.
Refilling a reusable water bottle at public fountains or from your cabin tap is the most practical way to stay hydrated without spending extra money. Most cruise lines allow you to bring an empty reusable bottle onboard and fill it as needed. Some ships even provide complimentary water bottles in your cabin or at guest services.
If you prefer bottled water and want to minimize cost, buying a case at a port and bringing it back to your cabin is often cheaper than purchasing individual bottles from the ship's stores.
Frequently Asked Questions
Is cruise ship tap water safe for children and infants?
Tap water on major cruise ships is safe for children. For infants, some parents prefer bottled water for formula preparation as an extra precaution, though this is not required. Ask guest services about the ship's water quality if you have specific concerns about your child's health.
Can I bring my own bottled water onboard?
Most cruise lines allow you to bring one or two bottles of water per person in your carry-on luggage. Check your specific cruise line's policy before packing, as rules vary. Once onboard, you can refill reusable bottles from tap water or purchase additional bottled water.
What about ice on a cruise ship — is it made from tap water?
Yes, ice served in drinks is made from the ship's treated tap water. It is safe to consume. If you are concerned about ice quality for any reason, you can request drinks without ice or ask for bottled water instead.
Is the water in the ship's pools and hot tubs safe to drink?
No. Pool and hot tub water is heavily chlorinated and treated differently than drinking water. It should never be consumed, though accidental swallowing while swimming is not dangerous.
What if I get sick from water during my cruise?
Illness during a cruise is usually caused by norovirus or other viruses spread through contact, not by tap water. If you become ill, visit the ship's medical center. They can provide treatment and determine the cause. Report any concerns about water quality to guest services at the same time.