Can You Drink Tap Water in Thailand?

Tap water in Thailand is generally unsafe for drinking. Although water treatment systems operate in major cities such as Bangkok, Chiang Mai, and Phuket, the water often becomes contaminated as it travels through old pipes, poorly maintained building storage tanks, and distribution systems that do not meet international safety standards. Locals rarely drink tap water directly. Most households either boil water, purchase bottled water, or use delivery refill stations that provide filtered water.

Visitors should follow the same advice. Tap water should not be used for drinking, brushing your teeth, or making ice unless it has been boiled for at least one minute. High-quality travel filters can be used, but simple jug filters will not remove bacteria or parasites. Waterborne risks in Thailand include E. coli, Giardia, Amoebas, and general gastrointestinal infections. Risks increase outside major tourist cities and on some islands where water treatment is less consistent.