The Sustainable Development Goal (SDG) 6 of the United Nations (UN), which was adopted in 2015, declares that "equitable access to clean and affordable drinking water for everyone" is critical (UN, 2016). The World Health Organization (WHO) and the United Nations Children's Fund (UNICEF) declared in 2012 that the world has achieved Millennium Development Goal (MDG) 7C, which intended to reduce the number of people without access to safe drinking water by half. This assertion, however, obscures enormous regional inequalities in water access: First, the majority of progress toward better water access has happened in Asia, where access to improved water sources rose from around 70% in 2000 to 90% in 2015. Sub-Saharan Africa is still a long way from reaching equal access, with over half of the rural population lacking access to clean drinking water.
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