For anyone thinking about traveling to or moving to Vietnam, "can you drink the tap water?" is one of the biggest questions. In Japan, water you can drink straight from the tap is taken for granted, but overseas the situation is very different.
In short, Vietnam's tap water is not suitable for drinking!
Even in major cities like Ho Chi Minh City, Hanoi, and Da Nang, drinking tap water straight is not recommended. Japan's Ministry of Foreign Affairs also states plainly that "the quality of Vietnam's tap water can hardly be called good and it is not suitable for drinking." This article thoroughly explains Vietnam's water situation and how to secure safe water while traveling or staying there.
Why Vietnam's tap water isn't drinkable
Different water-quality standards and contained substances
It is safest for travelers not to drink tap water in Vietnam directly. However, the figures cited in the earlier article — that standards are "more lenient than WHO guidelines" and that chlorine levels are "ten times those in Japan" — have been removed, as the region, time period, and measurement conditions cannot be verified. Water quality is affected not only by the treatment plant but also by building storage tanks and pipes.
The main risk factors in tap water are as follows.
- Residual heavy metals: Heavy metals such as lead, copper, iron, and zinc are present, and long-term intake may affect the kidneys, liver, nervous system, and blood system
- Residual pesticides: In Vietnam, a major agricultural country, pesticide residues from rural areas can find their way into water sources
- Presence of pathogens: Bacteria such as E. coli and Salmonella, and protozoa such as amoebas and Giardia, have been detected, and can cause symptoms like diarrhea, abdominal pain, and fever
- Contamination from factory wastewater: In industrial zones, contamination from factory wastewater, including organic matter (NO3-, NH4+) and mercury, has an impact
Sources VietScout, "Is Vietnam's tap water drinkable? A resident's guide to choosing safe water and taking precautions"created from
Why boiling doesn't make it safe
Some may think, "Surely it's fine if I boil it?"
Thorough boiling can inactivate many pathogens, but it is not a method for removing all chemical substances or turbidity. If the water is cloudy, discolored, has an unusual odor, or chemical contamination is suspected, do not rely on boiling — use sealed, safe drinking water instead. Harmful substances such as heavy metals and pesticides cannot be removed by boiling tap water. In fact, as water volume reduces, the concentration of harmful substances may actually increase. For this reason, boiling tap water alone cannot be considered unconditionally safe.
Many Vietnamese people also don't drink tap water directly; buying mineral water is the norm.
Water quality differences by city: the traits of Hanoi and Ho Chi Minh City
Hanoi is very hard water, Ho Chi Minh City is soft water
Vietnam's north-to-south geography means water quality can differ significantly between regions. There is insufficient basis for fixed city-level generalizations such as "Hanoi has very hard water and Ho Chi Minh City has soft water." Quality varies by water source, district, building infrastructure, and season; if hardness is relevant to you, check the supplier's analysis data or use a simple test kit.
Hanoi's very hard water contains a lot of minerals such as magnesium, so women will notice their hair feeling squeaky and shampoo lathering poorly. Those with long hair especially can improve lathering and the after-wash feel by using hard-water-friendly hair care products (such as L'Oreal or Schwarzkopf).
Ho Chi Minh City's soft water, on the other hand, is close to Japan's water quality, making it relatively familiar and easy for Japanese people to deal with.
Sources Vietwork, "[Vietnam water situation] Is tap water safe...?"created from
Is it okay to use tap water for brushing teeth and rinsing?
The risk of using tap water to brush your teeth or rinse your mouth is not as high as drinking it.
Still, using tap water for brushing or rinsing can let harmful substances or pathogens into your mouth. Opinions are divided even among Japanese residents in Vietnam, ranging from those who say "tap water is fine for soups or boiling vegetables" to those who "use mineral water for everything, even washing food and brushing teeth."
Even when brushing your teeth, if there is any chance of swallowing water, it is safest to use sealed bottled water or appropriately treated water. Do not assume that "you get used to tap water eventually"; infants, pregnant women, the elderly, and people with weakened immune systems should be especially cautious.
Can mineral water still upset your stomach?
Some people experience stomach upsets even when drinking mineral water. Diarrhea and stomach pain are not caused solely by water hardness; food, ice, infections, and physical condition are among multiple possible causes. If symptoms are severe, or if you experience bloody stools, high fever, dehydration, or prolonged illness, consult a medical facility.
Much of Vietnam's water is hard (containing minerals such as magnesium), so Japanese people who aren't used to hard water can get an upset stomach when they suddenly start drinking it. Choosing soft mineral water can ease this problem.
Is the ice and drinking water at restaurants safe?
About the safety of ice
When eating out in Vietnam, ice is often flagged as something to be careful about. In the Vietnamese style, ice goes into the famous Vietnamese coffee, of course, but also into sinh to (fruit juice) and even beer.
The risk from ice varies depending on the shop and how it is manufactured and stored; it cannot be uniformly described as "reasonably safe."
This is because no one would make ice using tap water that is known to be undrinkable. Ice consumption is high in Vietnam, and most food and drink establishments — from local cafés to upscale restaurants — purchase ice from suppliers. Even supplier-made ice can be contaminated during transport, storage, or handling. At establishments where you cannot assess hygiene conditions, ask for no ice; choose ice only when you can confirm it has been made from safe drinking water.
That said, it can't be called 100% safe. If you're worried, it's safest to avoid it. Being on edge would ruin an otherwise good meal.
Sources TNK Travel, "Is Vietnam's water safe? Vietnamese mineral water you can buy with peace of mind"created from
How to secure safe water: at home and out and about
How to secure water at home
If you're living in Vietnam, there are mainly two ways to secure drinking water at home.
1. Installing a water purifier
Middle-class and above Vietnamese households almost always have a water purifier installed. Installing one lets you use tap water as drinking water. It's an especially recommended method for those staying long-term.
2. Water delivery service
A water delivery service brings large mineral water bottles (19 liters) to your home or office. You can also rent a water dispenser. It's a convenient service that works for everything from short stays to long-term living.
Staying hydrated when out and about
As a basic rule, buy mineral water at convenience stores, supermarkets, or street stalls. Choose products that are factory-sealed and unopened, show no cloudiness, unusual odor, or damage, and come from a reliable retailer. We do not assert that all commercially available products are safe.
Bottled water in Vietnam costs roughly half what it does in Japan. Prices vary by shop, but both 500ml and 1L bottles run around 12,000 dong (about 73 yen). It's cheap enough to buy without hesitation, so stay on top of your hydration.
Sources TNK Travel, "Is Vietnam's water safe? Vietnamese mineral water you can buy with peace of mind"created from
Five recommended mineral waters
There are many types of mineral water in Vietnam, so you may be unsure what to buy. For those who are uncertain, we introduce mineral water brands commonly seen in Vietnam. The following are examples of products in circulation, but we do not treat all of them as soft water. Since water sources and product specifications can change, please check the label for hardness, mineral content, and whether the water is carbonated.
1. Dasani
Sold by Coca-Cola, this water has the same logo design as Japan's "I Lohas." The taste is neutral and, being soft water, very easy to drink, so it's recommended. It's reasonably priced at 5,000 VND (about 30 yen) for 500ml.
2. Aquafina
Aquafina comes from Suntory PepsiCo. Its soft PET-bottle material gives a gentle mouthfeel and it's very easy to drink. It has a familiar, easy taste for Japanese people too.
3. La Vie
Sold by Nestle, "La Vie" is a water you'll see all over Vietnam. It's often stocked in hotels as well. Personally I get the impression it has a slight character to it, but it's beloved by many people.
4. I-on Life
This is another water you'll see often in Vietnam. It has a sports-drink-like flavor and is well suited to replenishing minerals.
5. Evian
If you like hard water, Evian, familiar in Japan too, is recommended, though it's a bit pricey. You can buy it in Vietnam as well.
Sources TNK Travel, "Is Vietnam's water safe? Vietnamese mineral water you can buy with peace of mind"created from
Water Safety Checklist for Travelers
- For drinking and brushing teeth, use factory-sealed unopened bottles or properly treated water
- Check the tamper-evident ring, cloudiness, unusual odor, holes in the container, and signs of resealing
- Avoid ice, juice, and washed raw vegetables if the water source is unknown
- For hot tea or coffee, choose drinks made with water that has just been boiled
- For water filters, verify the filtration method, replacement schedule, and whether the performance suits the source water
Summary: to secure water safely in Vietnam
Vietnam's tap water is not suitable for drinking, even in major cities like Ho Chi Minh City, Hanoi, and Da Nang. It may contain heavy metals, pesticides, and pathogens, and the reality is that boiling doesn't make it completely safe.
To secure safe water, keep the following points in mind.
- Always buy mineral water for drinking
- Choosing soft mineral water (such as Dasani or Aquafina) makes an upset stomach less likely
- Restaurant ice is basically safe, but avoid it if you're worried
- For long stays, consider installing a water purifier or using a water delivery service
- For brushing teeth and rinsing too, use mineral water until you get used to things
By understanding Vietnam's water situation and responding appropriately, you can make your stay comfortable and safe. Mineral water costs about half of what it does in Japan, so keep hydrating throughout the day and enjoy your time in Vietnam to the fullest!
If you're planning to travel to or move to Vietnam, use this article as a reference and put these safe-water methods into practice.
