The terms 'improved water source' and 'unimproved water source' were coined in 2002 as a drinking water monitoring tool by the JMP of UNICEF and WHO. The term, improved water source refers to "piped water on premises (piped household water connection located inside the user’s dwelling, plot or yard), and other improved drinking water sources (public taps or standpipes, tube wells or boreholes, protected dug wells, protected springs, and rainwater collection). " Improved sources are also monitored based on whether water is available when needed (5. 8 billion people), located on premises (5. 4 billion), free from contamination (5. 4 ), and "within 30 minutes' round trip to collect water. ' :3 While improved water sources such as protected piped water are more likely to provide safe and adequate water as they may prevent contact with human excreta, for example, this is not always the case. According to a 2014 study, approximately 25% of improved sources contained fecal contamination.
Drinking water , also known as potable water , is water that is safe to drink or to use for food preparation . The amount of drinking water required varies.  It depends on physical activity, age, health issues, and environmental conditions.  Americans, on average, drink one litre of water a day and 95% drink less than three litres per day.  For those who work in a hot climate, up to 16 liters a day may be required.  Water is essential for life. 
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