Worldwide Rating of Drinking Water Safety

The Worldwide Rating of Drinking Water Safety prepared by Safe Water for International Travelers (SWIT), is a classification of drinking water sdafety that gives a broad indication of the health risks related with drinking water to which international travellers may be exposed in every country in the world.

The rating is based on significant indicators produced by various trustworthy organisations and is arranged into five classes of drinking water safety:

5 drops countries	All cities have safe water supplies which are monitored and regularly tested by an independent and qualified board and drinking water quality is the standard in developed countries. Waterborne diseases are almost non-existent. Only 20% of the world countries have this top classification.
4 drops countries	Main cities have generally safe water supplies which are monitored and regularly tested by an independent and qualified board but level of service of rural and small towns systems could be sub-standard. Prevalence of waterborne diseases is low.
3 drops countries	The level of service quality varies considerably between urban and rural regions. Some systems comply with WHO guidelines but many of them have intermittent service and lack of disinfection. Monitoring and testing is not fully reliable. Some waterborne diseases are endemic.
2 drops countries	Some water supplies comply with WHO guidelines but most of them do not.There is no permanent monitoring or testing. Usually water quality is not good. Prevalence of waterborne diseses is High.
1 drop countries	It is almost impossible to find drinking water that complies with WHO guidelines. There is no monitoring or testing. Waterborne diseases are the main cause of infant mortality. Usually it is dangerous for foreign visitors to drink tap water.

WHO Drinking Water Quiality Guidelines