Tap water in Bangkok: can you drink it, and where to find safe drinking water

In Bangkok, tap water is treated by the Metropolitan Waterworks Authority (MWA), but most residents and health guides advise visitors not to drink it straight from the tap: the risk comes mainly from old pipes and building storage tanks, not from the treatment plant. The simplest solution is to drink sealed bottled water or to refill your bottle at a filtered-water machine. This guide explains what to drink, what to be careful about (ice, juices, brushing your teeth) and where to find safe water. Information checked in October 2026; if in doubt, follow your hotel's advice.

Can you drink the tap water?

A street vendor in Bangkok

The cautious answer is no, not directly. The water is treated to standard before it leaves the plant, but it then travels through old pipes and, in most buildings, a rooftop or basement tank that can affect it. In practice, Bangkok residents drink bottled or filtered water. For a short trip it is better not to take the risk: a stomach bug costs more in lost days than a bottle of water.

Where to find drinking water

Sealed bottles: sold everywhere (convenience stores, supermarkets, kiosks) for a few baht per small bottle. Check that the cap is intact.
Filtered-water machines: found on the corner of many streets, charging a few baht per litre; you bring your own bottle. This is the cheapest and least wasteful option.
Hotels and hostels: many offer bottles or a water dispenser. Ask whether the water is filtered before filling your bottle.
Filter bottle: useful on a long stay; it does not replace sealed bottles for a traveller with a sensitive stomach.

Ice, juices and brushing your teeth

Ice: in established restaurants and cafés the ice is usually industrial (cylinders with a hole through the middle) and made with treated water; it is common and low-risk. Be careful with crushed or block ice at small stalls with limited clean water.
Juices and fresh-pressed drinks: choose busy stalls with a high turnover.
Brushing your teeth: as a precaution, use bottled water for the first few days, especially if your stomach is sensitive.
Fruit and raw vegetables: sometimes washed in tap water; prefer fruit that is peeled in front of you.

If you get sick

Traveller's diarrhoea is treated with fluids (oral rehydration salts from a pharmacy) and rest; see a doctor if it lasts more than two days, or if there is fever or blood. Useful addresses are in our guide to emergencies and health in Bangkok.

Going further

To eat with confidence, see our guide to street food in Bangkok. If you are visiting with family, also read Bangkok with children, and remember the heat: carry a bottle and drink regularly (see our tips on the trip budget).