It is not recommended to drink unfiltered tap water in Cabo San Lucas.
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Tap water in Cabo is fine, and meets regular standards for purity and cleanliness. But pipes may be old. So everyone tends to drink bottled water – which you can buy everywhere. And don't worry about ice in your drinks.
No — Mexico Locals drink bottled water.To make Mexico water safe to drink, you'd have to boil it or use a filterable water bottle like the Water-To-Go. Many locals buy a garrafón (five gallon water jug), and keep those in their homes for use.
Most of the water and ice in hotels, resorts, and tourist restaurants are safe. Many offer purified bottled water and many of the resorts have desalination plants that purify the water on site.
As a precaution you should not drink tap water in Mexico even if it's purified at the source. Most resorts and hotels provide bottled water or large jugs of purified water for you to refill your bottle.
You're likely to come across info saying salads are the #1 what not to eat in Mexico food. Now, if not eating them makes you feel better, then don't. However, there's no evidence this is true. There's so much amazing produce in Mexico to try — just make sure to clean it thouroughly.
Most of the water and ice in hotels, resorts, and tourist restaurants are safe. Many offer purified bottled water and many of the resorts have desalination plants that purify the water on site.
The norm for waiters is 15% to 20% of the bill, depending on service (make sure a 15% service charge hasn't already been added to the bill, although this practice is more common in resorts).
There are, however, active ways to try and make sure that you don't get sick while vacationing in Cabo. Not drinking tap water is step one, and trying to avoid eating street food would likely be step two. The desert climate that Cabo boasts gives it an advantage over spots like Playa del Carmen.
Avoid rocky shores where waves pound the beach and head to one of these swimming beaches in Cabo San Lucas to stay safe in the water. The top spots for swimming in Cabo are Medano Beach, Chileno Beach, Santa Maria Beach, the Cannery Beach, and Lover's Beach.