Supplying clean water and toilets for all could take hundreds of years in countries like Eritrea and Namibia unless governments step up funding to tackle the problem and its harmful effects on health, an international development agency warned on Monday.
Meeting it will cost $28 billion per year, the non-profit said.
"Water, sanitation and hygiene is a global crisis," said Savio Carvalho, WaterAid's global advocacy director.
"We're really calling for governments to pull up their socks," he told the Thomson Reuters Foundation from the United Nations in New York.
From July 9-18, governments are reviewing progress on the Sustainable Development Goals, which were agreed at the United Nations in 2015, with a focus on six of the 17.
By the 2030 deadline, "a significant number of people" in 80 countries are unlikely to have access to clean water, while poor sanitation is expected to persist in more than 100 nations, WaterAid said.
Drawing on U.N. data, the UK-based group calculated some countries will need hundreds of years to provide safe drinking water and toilets for all their people, meaning countries collectively are thousands of years off track.
It could be 500 years before every Romanian has access to a toilet, and 450 years for Ghanaians, it added.
"There's money around - it's just not allocated in the right way," he said, urging international donors to increase spending on water and sanitation.
WaterAid quoted World Bank data showing the knock-on effects of inadequate sanitation - which causes child deaths from poor hygiene and preventable disease - cost $220 billion in 2015.
"For the nations collectively to be thousands of years off track in meeting these human rights is shocking," WaterAid Chief Executive Tim Wainwright said in a statement.
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