Tap water in Cancun is not recommended for drinking, even for locals. But don't worry. With a bit of preparation and know-how, you'll have no problem staying properly hydrated during your stay.
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Although there will be some bacteria in the water from the tap it is fine to brush your teeth with, even if you are at a place where you can't drink the tap water.
To the OP, in all seriousness, the water in Cancun is fine for bathing/showering; I wouldn't recommend you drink it though. It's not that the water is inherently unsafe it's that it almost certainly has minerals dissolved in it that your body isn't used to and may cause intestinal upset.
Most private hotels and restaurants in Cancun will have an on-site filtration system installed or offer guests drinking water that has been purified or bottled.
Why does the water smell in Cancun? Sargassum seaweed is a type of macroalgae that forms over the Atlantic Ocean each year in large quantities. The foul-smelling but harmless seaweed is a perennial issue for Caribbean destinations like Cancun, which see huge quantities of the macroalgae wash up on their shores yearly.
The short answer is that anyone visiting Cancun on vacation is best advised to drink bottled water. Regardless of whether the tap water meets the standards of safety needed to be safe for drinking, a change in water from what you are used to can cause an upset stomachs.
Locals don't drink the tap water, and they don't make ice cubes with it either. While boiling water does kill off bacteria, freezing it does not, so by and large, ice is safe in Mexico. You can relax and enjoy your trip now that you know the ice in Mexican drinks is safe!
?? Yes, Mexico ice is safe to consume. Though plenty of other articles will tell you to avoid ice in your drink, there's no reason to think anyone's making ice with tap water. Now, if you want to avoid ice for your own peace of mind, then go ahead.
But if you're stuck wondering if it's safe to travel to Cancun, our answer is a definite yes! Since Cancun brings so much revenue to Mexico, they've got a vested interest in safety and security within the Hotel Zone. Even outside of that area, Cancun is still known as a safe city with a low crime rate.
The answer is yes. You can walk along the shore in Punta Cancun and along the lagoon. The central and south areas of the Cancun hotel zone are not so pleasant to walk by because of their many buildings. Besides, a long walk under the scorching heat can wear you out, but you can do it, and it's safe.
Sargassum is at its worst between April and August, peaking in July and August, although this year saw the seaweed arrive early, with some beaches being hit heavily in March.
We get a lot of questions here about jellyfish, the favorite season of that critters is during the trade winds of March - June. However we do not get many jellyfish and this would be a snorkeler's or diver's least concern. Your chances of getting a serious sting would be 1:5000 or more.
Yes, the ice in your drink is safe. The ice that is provided to restaurants, bars and convenience stores is produced in ice factories using purified water. Hotels and restaurants that use ice machines also use purified water. Even the local guys downtown selling home-made popsicles use purified water!