Papua New Guinea, where 60% of the population live without a safe water supply, is the most difficult and expensive place in the world to access clean water, according to a study released by WaterAid.
The study found that people in Papua New Guinea are forced to spend more than half their income on accessing water. In Port Moresby, a day's wages can be as little as $5.22 per day, a day's worth of water (13.2 gal) costs $2.67.
Equatorial Guinea, Angola, Chad and Mozambique joined Papua New Guinea in the bottom five countries according to the percentage of households with access to clean water.
When ranking countries by the number of people living without access to safe water, India comes out worst – 75.8 million people have no access to safe water, followed by China, Nigeria and Ethiopia.
Henry Northover, head of policy for WaterAid, said the global water and sanitation crisis was not a problem of limited supplies.