It estimated that by the end of 2010 more than six billion people – around 89 per cent of the world's population – had access to safe water.
That is one per cent more than the 88 per cent target set out in the UN Millennium Development Goals (MDG) number seven, set in 2000.
The report also highlights the immense challenges that remain regarding the drinking water target. Global figures show massive disparities between regions and countries, and within individual nations.
For instance, 11 per cent of the world population, or about 783 million people, still have no access to improved drinking water.
There also are huge regional disparities with four out of 10 people without access to safe water living in Sub-Saharan Africa.
Another disparity is the number of people in rural areas using unimproved water sources, which is five times greater than in urban areas.
And, eight out of 10 people living in urban areas have piped water connections on their premises, compared to only three in 10 people in rural areas.
Finally the UNICEF-WHO joint monitoring program also warned that the data collected does not assess the quality, or reliability of the water supply, or whether water sources were sustainable.