Safety & PracticalitiesBy Clever Tourists · Published
No. Do not drink Thailand's tap water straight from the tap, in Bangkok or anywhere else; use sealed, boiled or filtered water. World Travel Guide says tap water in Thailand "is not considered safe to drink" and advises sealed, boiled or properly filtered water. Bangkok's Metropolitan Waterworks Authority says the water it supplies is safe, but several travel sources point out that the pipes between the plant and your room are the weak point, and the sensible traveller rule is the same everywhere. We were in Thailand from December 2022 to January 2023, in Bangkok, Chiang Mai, Mae Hong Son, Khao Sok and Ao Nang, and this page is the practical version: what to drink, what to skip, and where ice fits.
• Sealed bottled water: sold in every 7-Eleven, supermarket and many street stalls; check the cap seal is intact.
• Water from a filtered refill machine or large dispenser: hotels and guesthouses often provide a big filtered water jug or a refill point, and standalone refill machines are common on the street.
• Boiled water: tea, coffee and soup are made with boiled water and are safe when served hot.
• Canned and bottled drinks: soft drinks, coconut water cut open in front of you and bottled beer are fine; avoid unsealed juices from questionable sources.
Bangkok's tap water is treated by the Metropolitan Waterworks Authority, which describes it as meeting drinking-water standards. The caution from travel guidance is about the delivery, because water travels through old building tanks and pipes before it reaches a tap. Locals generally drink bottled, filtered or boiled water, and the same habit protects visitors. We could not confirm a recent Thai government advisory aimed at tourists, so we rely on World Travel Guide and the CDC's general food-and-water guidance, which does not single out tap water but stresses safe food and water habits.
Rinse your toothbrush with bottled or filtered water if you have a sensitive stomach, and do not open your mouth in the shower. Many travellers brush with tap water without trouble, but there is no benefit in taking the risk on a short trip.
Ice is the question people actually ask. World Travel Guide notes that most hotels and better restaurants use purified, factory-made ice, which is generally safe, and advises caution with iced drinks at small roadside stalls. In practice the cylinder-shaped ice with a hole through the middle is commercially produced, and that is the kind you will see in busy restaurants and cafes. Crushed ice that looks home-made, or a bucket sitting in the sun at a roadside stall, is the one to decline.
For street food, the standard rule applies: busy stalls with high turnover, food cooked in front of you and served hot, and fruit you peel yourself. Our Thailand safety guide covers food, scams and health in more depth.
On islands and in remote areas, water is often trucked in, stored in tanks or pumped from wells, so quality is more variable and bottled water is the baseline. That applies to Ao Nang and the Andaman coast, to Khao Sok's floating bungalows, and to Chiang Mai's mountain districts. Resorts usually provide free bottles or a filtered dispenser.
Never drink from rivers, waterfalls or springs. The CDC's Thailand page warns against swimming in freshwater where sanitation is poor, and lists leptospirosis and melioidosis as risks from contaminated or floodwater; avoid swallowing water when swimming.
Single-use plastic adds up on a multi-week trip. A refillable bottle plus refill machines or a hotel dispenser cuts that. Large bottles of drinking water are cheap at 7-Eleven and supermarkets, much cheaper per litre than small bottles; our Thailand grocery guide lists what to buy and roughly where. A small bottle of water at a tourist attraction will cost more than at a convenience store, so buy before you go.
A water filter bottle or purification tablets are worth considering for trekking in Mae Hong Son or the national parks, where refill points are not guaranteed.
During Songkran in mid-April, people douse each other in water in the street. That water is not drinking water, so keep your mouth shut and avoid swallowing it, and protect your phone. Our Songkran 2027 guide has dates and where it gets wildest.
Pack a refillable bottle and fill it at hotel dispensers or street refill machines rather than buying a small bottle every time. Keep one sealed bottle in your day bag for days when you cannot find a refill point, and take more on boat days and treks, since sun and humidity increase how much you drink.
If you have a sensitive stomach, avoid raw salads washed in tap water for the first few days, eat at busy places where food is cooked to order, and wash or sanitise your hands before eating. Bring oral rehydration salts, which are cheap at pharmacies in Thailand as well, and see our vaccines and health prep guide for typhoid and hepatitis A, the two vaccine-preventable diseases the CDC links with food and water.
Water is seldom a problem for visitors who follow these rules, and it adds almost nothing to the daily budget.
Many travellers do without problems, but the cautious choice is bottled or filtered water, especially if you have a sensitive stomach or are in an island or rural area.
Usually yes at hotels and better restaurants, where ice is purified and factory-made. Be cautious with iced drinks from small roadside stalls, as World Travel Guide advises.
Do not drink it straight from the tap. Use the bottled water provided, a filtered dispenser, or bottles from a 7-Eleven.
Be careful. The CDC advises against swimming in freshwater where sanitation is poor and against swallowing water when swimming, because of germs and diseases like leptospirosis.
A refillable bottle, plus a filter bottle or tablets if you plan to trek. Buy large bottles at 7-Eleven or supermarkets rather than small tourist-spot bottles.
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