Why can locals drink it when I can’t?

Residents build up tolerance to the particular microbes and mineral balance in their local supply over years of exposure. A visitor’s gut hasn’t met those organisms, so the same glass of water that’s unremarkable for a local can cause traveller’s diarrhoea for you. It’s about unfamiliarity as much as contamination — which is why even some treated supplies are still best avoided on a short trip.

What about ice, brushing teeth, and washed food?

Where tap water isn’t recommended, the same caution applies to anything made with it. Skip ice unless you know it’s from purified water, brush your teeth with bottled or boiled water, and be wary of salads and unpeeled fruit rinsed in tap water. Hot drinks made with boiled water, sealed bottled drinks, and fruit you peel yourself are the safer bets.

How can I make tap water safe?

Bringing water to a rolling boil for about a minute (three at high altitude) reliably kills microbes. A travel water filter rated for bacteria and protozoa, or purification tablets/drops, also work well and cut down on plastic. Sealed bottled water is the simplest option — just check the seal is intact, since refilled bottles are sometimes sold as new.

Is bottled water always the safest choice?

It’s usually the most convenient safe option, but it isn’t foolproof: check the cap seal, and be aware bottled water is a major source of plastic waste. In places with safe tap water, bottled offers no health benefit at all — a reusable bottle is cheaper and greener. When you’re unsure, a filter or boiling gives you safe water without relying on the bottle supply.

💧 Tool

Can I Drink the Tap Water?

Whether tap water is safe to drink in your destination, based on CDC traveller guidance — and what to do where it isn’t. Pick a country to check before you go.

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Destination

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Tap water in Mexico

Not recommended — use bottled or filtered

Stick to sealed bottled water (or filtered/boiled), skip ice made from tap water, be wary of unpeeled produce rinsed in tap water, and brush your teeth with safe water. “Not recommended” means risky for visitors — not necessarily polluted.

Locals and resorts use purified “garrafón” water; sealed bottled water is cheap and everywhere.

Staying safe

Sealed bottled water, or tap water boiled for a minute (longer at altitude), a proper travel filter, or purification tablets. Avoid ice unless you know it’s from safe water, and use safe water to brush your teeth.

General guidance based on CDC traveller classifications, cross-checked across travel-health sources. Water quality changes and varies locally — when in doubt, choose sealed bottled or filtered water. This isn’t medical advice; check current CDC Travelers’ Health notices for your trip.

By SK KutubuddinReviewed May 2026

Quick Answer

Where is tap water safe to drink?

Broadly, tap water is safe across the US, Canada, most of Europe, Japan, South Korea, Singapore, the Gulf states, Australia and New Zealand. It’s generally not recommended for visitors across most of Africa, Latin America, the Middle East and much of Asia — including popular spots like Mexico, India, Thailand and Egypt. Pick your destination above for the specifics.

Mostly safe

North America

Safe

Western Europe

Mostly avoid

Latin America

Bottled/filtered

When unsure

Methodology: Each country is classified using the CDC’s traveller guidance — “safe” where food and water standards are broadly comparable to the US, “not recommended” where the CDC advises visitors avoid tap water — cross-checked across multiple 2026 travel-health references. The data is curated to popular destinations rather than guessed for every country, the wording follows the CDC’s own framing (“not recommended” = risky for visitors, not necessarily polluted), and because quality changes and varies locally the tool errs toward caution and always points to sealed bottled or filtered water when in doubt. This is general travel information, not medical advice. How we test & calculate.

One of the most common travel questions

“Can I drink the tap water here?” is something almost every traveller wonders, and the honest answer is that it splits the world fairly cleanly. Across North America, most of Europe, the wealthier parts of East Asia and the Gulf, plus Australia and New Zealand, tap water meets standards comparable to home. Across much of Africa, Latin America, the Middle East and South and Southeast Asia, the CDC advises visitors to stick to bottled or treated water — not because the water is necessarily dirty, but because it can carry microbes your body simply isn’t used to.

“Not recommended” isn’t the same as “polluted”

This is the part most lists get wrong. When a country is marked not recommended, it usually means the local supply contains organisms that residents tolerate after years of exposure but that give visitors traveller’s diarrhoea. Plenty of big cities in those countries treat their water well — but on a short trip, your gut hasn’t had time to adapt, so caution pays off. That’s why this tool leans conservative and tells you the safe alternatives rather than splitting hairs over local treatment quality.

Where it’s not safe, it’s easy to manage

Avoiding tap water rarely means going thirsty. Sealed bottled water is cheap and everywhere in most destinations — just check the cap seal. A travel filter or purification tablets give you safe water without the plastic, and boiling for a minute (longer at altitude) works anywhere you have a kettle. Remember the water touches more than your glass: ice, the water you brush your teeth with, and produce rinsed at the market all count.

When in doubt, default to caution

Conditions change — a city can have a temporary boil-water notice, and rural areas served by wells differ from the capital. Treat this as a starting point, check current CDC Travelers’ Health notices for your specific trip, and if you’re ever unsure, bottled or filtered water is the safe call. It’s general information, not medical advice.

Frequently Asked Questions

This tool follows the CDC’s traveller classification: countries where food and water standards are broadly comparable to the US are marked safe, and those where the CDC advises visitors to avoid tap water are marked “not recommended”. Importantly, “not recommended” doesn’t mean the water is polluted — it means it can carry microbes that locals tolerate but visitors often don’t. Standards change and vary locally, so the tool errs toward caution.