What to use for drinking
| Situation | Practical choice |
|---|---|
| Drinking straight from the tap | Avoid it |
| Tea or coffee made with freshly boiled water | Suitable if chemical contamination is not suspected |
| Washing or showering | Normal household use; avoid swallowing the water |
| Brushing teeth | Use safe water if you may swallow it or are medically vulnerable |
| Ice in a drink | Choose ice made from treated water when the source is known |
| Preparing infant formula | Use water and preparation steps that meet the product and health guidance |
Why tap water is different from drinking water
Water may pass through a municipal system and still be unsafe to drink at the tap. Treatment, building pipes, storage tanks and local supply interruptions can affect water quality. The CDC's Vietnam travel guidance says tap water is not safe to drink. Do not treat clear taste or appearance as proof of safety.
Bottled and delivered water
Check that a bottle's seal is intact before opening it. For large delivered containers, check the cap and source, and clean the dispenser on schedule. Store drinking water away from heat and chemicals. If a seal is broken or the source is unclear, choose another supply.
Boiling and filters
Boiling is useful for many disease-causing microbes, but it does not remove chemical contamination, heavy metals or salt. Let boiled water cool in a clean, covered container. A carbon jug filter may improve taste without making unsafe water safe. Read the manufacturer's label for the specific contaminants it reduces, replacement interval and treatment limits.
Ice at cafes and restaurants
Ask whether the venue uses commercially produced ice or water treated for drinking. If the source is unknown and you are at higher risk from infection, order a drink without ice. Do not rely only on the shape or clarity of the ice.
Children and people with reduced immunity
Use safe water for drinking and food preparation. For infant formula, follow the formula label and health professional's advice; do not improvise a different dilution. If a child develops repeated vomiting, diarrhoea, unusual sleepiness or very little urine, seek medical advice promptly.
After a flood or supply interruption
Do not drink tap water during an official boil-water or contamination notice unless local authorities say the supply is safe. Use sealed bottled water for drinking, brushing teeth and cooking. Follow the local authority's instructions for flushing pipes and cleaning containers.
Apartment checklist
- Keep sealed drinking water for the first night after moving in.
- Ask building management about supply interruptions and the water tank's cleaning schedule.
- Clean and cover the dispenser or storage container.
- Keep a separate supply for a child, a sick person or a storm disruption.
Questions and answers
Can I drink tap water in Nha Trang?
The CDC advises travellers not to drink tap water in Vietnam. Choose sealed bottled or properly treated water.
Can I boil tap water?
Boiling can kill many microbes, but it does not remove chemical contamination. Follow any local water notice.
Is ice in Vietnam unsafe?
It depends on the source. Choose ice made from treated water or skip it if the source is unknown.
Does a regular jug filter make tap water safe?
Not necessarily. Check the filter's certified contaminant reduction and limits.
Can I brush my teeth with tap water?
Avoid swallowing it. Use safe water if you are medically vulnerable or preparing for a young child.