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Today, 1.8 billion people use a source of drinking water contaminated with faeces, putting them at risk of contracting cholera, dysentery, typhoid and polio. The Sustainable Development Goals, launched in 2015, include a target to ensure everyone has access to safe water by 2030, making water a key issue in the fight to eradicate extreme poverty. 

In 1993, the United Nations General Assembly officially designated March 22 as World Water Day. World Water Day is coordinated by UN-Water in collaboration with governments and partners. This year's theme: wastewater. Around 80% of wastewater just flows back to nature untreated, polluting the environment and wasting a precious resource.

Watch "World Water Day 2017: Why waste water?" video