* A yellow fever vaccination certificate is required from travellers over one year of age arriving from an infected area.

Mains water is chlorinated and safe to drink in the main towns. Elsewhere, drinking water should be considered a potential health risk and sterilisation is advisable. Bottled water is available. Milk is pasteurised and dairy products are safe for consumption. Local meat, poultry and seafood are generally considered safe to eat. It is advised to wash vegetables and fruit with boiled water and boil any questionable drinking water before use.

Vaccinations against tuberculosis and hepatitis B are sometimes recommended.

The government provides comprehensive medical and dental facilities for residents and visitors. There are hospitals in Vaiola (Tongatapu), Hihifo (Ha'apai) and Neiafu (Vava'u), which will treat minor ailments and dispense medicines. There are also clinics, dispensaries, chemists and pharmacies. However, serious medical problems should be taken to Australia, Hawaii, New Zealand or Pago Pago (American Samoa). Visitors only pay a token fee for medicines. There are also competent private medical practitioners. Health insurance is recommended. For emergency services, dial 911.