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== Visual data ==
<gallery align="center" perrow="2" widths="500" heights="500" mode="nolines">
File:Percentage of population with access to safe drinking water among South American countries..png|Percentage of population with access to safe drinking water among South American countries.
File:Percentage of population with access to safe drinking water among American insular countries..png|Percentage of population with access to safe drinking water among American insular countries.
File:Percentage of population with access to safe drinking water among countries in North America..png|Percentage of population with access to safe drinking water among countries in North America.
File:Percentage of population with access to safe drinking water among countries from Eastern Europe..png|Percentage of population with access to safe drinking water among countries from Eastern Europe.
File:Percentage of population with access to safe drinking water among countries belonging to the ex USSR..png|Percentage of population with access to safe drinking water among countries belonging to the ex USSR.
File:Percentage of population with access to safe drinking water among Central American countries..png|Percentage of population with access to safe drinking water among Central American countries.
File:Percentage of population with access to safe drinking water among Northern African countries..png|Percentage of population with access to safe drinking water among Northern African countries.
File:Percentage of population with access to safe drinking water among countries in Western Africa..png|Percentage of population with access to safe drinking water among countries in Western Africa.
File:Percentage of population with access to safe drinking water among countries in Eastern Africa..png|Percentage of population with access to safe drinking water among countries in Eastern Africa.
File:Percentage of population with access to safe drinking water among countries in Southern Africa..png|Percentage of population with access to safe drinking water among countries in Southern Africa.
File:Percentage of population with access to safe drinking water among countries in West Asia..png|Percentage of population with access to safe drinking water among countries in West Asia.
File:Percentage of population with access to safe drinking water among countries in the Arabian peninsula..png|Percentage of population with access to safe drinking water among countries in the Arabian peninsula.
File:Percentage of population with access to safe drinking water among countries in continental South East Asia..png|Percentage of population with access to safe drinking water among countries in continental South East Asia.
File:Percentage of population with access to safe drinking water among countries in continental and insular East Asia..png|Percentage of population with access to safe drinking water among countries in continental and insular East Asia.
File:Percentage of population with access to safe drinking water in advanced European economies..png|Percentage of population with access to safe drinking water in advanced European economies.
File:Percentage of population with access to safe drinking water among countries in Oceania..png|Percentage of population with access to safe drinking water among countries in Oceania.
</gallery>
[[File:Percentage of population with access to safe drinking water among countries in Central Africa..png|thumb|left|1000px|Percentage of population with access to safe drinking water among countries in Central Africa.]]
==Full timeline==
| 1910 || Chlorination || {{w|U.S. Army}} {{w|Major}} {{w|Carl Rogers Darnall}}, a Professor of Chemistry at the {{w|Army Medical School}}, develops the technique of purification of drinking water by use of compressed liquefied chlorine gas.<ref>{{cite book|title=Textbooks of Military Medicine: Military Preventive Medicine, Mobilization and Deployment, V. l, 2003|publisher=Government Printing Office|url=https://books.google.com.ar/books?id=wKM1KFMDdRMC&pg=PA109&lpg=PA109&dq=%22Darnall%22+%221910%22+%22water%22+%22purification%22&source=bl&ots=HcsquWkxDL&sig=_LTsGvfRgcLvLw3MVH8GG19T4X4&hl=en&sa=X&ved=0ahUKEwjR273GnbHWAhWMIJAKHRpWDPMQ6AEIRDAI#v=onepage&q=%22Darnall%22%20%221910%22%20%22water%22%20%22purification%22&f=false|accessdate=19 September 2017}}</ref> || {{w|United States}}
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| 1913 || Wastewater treatment || The {{w|activated sludge}} process, a type of {{w:|wastewater treatment}} process for treating {{w|sewage}} or [[w:industrial wastewater treatment|industrial wastewaters]], is first discovered.<ref name=Beychok>{{cite book | author=Beychok, Milton R. | title={{w|Aqueous Wastes from Petroleum and Petrochemical Plants}}| edition=1st | publisher=John Wiley & Sons Ltd | year=1967 | id=[[Library of Congress Control Number|LCCN 67019834]]}}</ref> || {{w|United Kingdom}}
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| 1912 – 1914 || Policy || The Public Health Service Act is passed in the United States, authorizing regular surveys and studies of water pollution. The act is aimed at discovering the dangers water could have on human health. In 1914, the act would introduced the idea of maximum contaminant levels, but only for water supplies serving interstate transportation.<ref name="Drinking Water History Milestones"/> || {{w|United States}}
|vauthors=Kuusi M, Klemets P, Miettinen I, etal |title=An outbreak of gastroenteritis from a non-chlorinated community water supply |journal=J Epidemiol Community Health |volume=58 |issue=4 |pages=273–7 |date=April 2004 |pmid=15026434 |pmc=1732716 |doi= 10.1136/jech.2003.009928|url=http://jech.bmj.com/cgi/pmidlookup?view=long&pmid=15026434}}</ref> || {{w|Finland}}
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| 2001 || Statistics || At the end of the year, there are 15,223 completed or contracted plants worldwide, with fresh waterproduction capacity of more than 6.8 billion gallons of water daily. Nearly 60% of that capacity uses, or will use seawater, with the remaining using brackish or other feedwater.<ref name="DESALINATION AS A WATER SOURCE F O R MUNICIPAL AND INDUSTRIAL WATER USERS : THE FUTURE IS NOW"/> ||
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| 2004 || Crisis || Contamination of the community water supply, serving the Bergen city centre of Norway, is reported after the outbreak of waterborne {{w|giardiasis}}.<ref name="alcow">{{cite journal
===What the timeline is still missing===
[http://www.water-technology.net/watersupply/]
===Timeline update strategy===
