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| url = http://202.136.7.26/images/jhpn242_Arsenic-contamination.pdf
}}
</ref> Of these, four major incidents were in Asia, including locations in [[Thailand]], [[Taiwan]], and [[People's Republic of China|Mainland China]].<ref name=chowdhury>{{cite journal
| title = Groundwater arsenic contamination in Bangladesh and West Bengal, India
| author = Chowdhury U. K., Biswas B. K., Chowdhury T. R.
| publisher = Brogan &
}}</ref>
In South America, [[Argentina]] and [[Chile]] are affected. There are also many locations in the [[United States]] where the groundwater contains arsenic concentrations in excess of the [[United States Environmental Protection Agency|Environmental Protection Agency]] standard of 10 parts per billion adopted in 2001. According to a recent film funded by the US [[Superfund]], {{cite web |url=http://www.youtube.com/watch?v=hi5DfRy01vE |title=In Small Doses |format= |work= |accessdate=}}, millions of private wells have unknown arsenic levels, and in some areas of the US, over 20% of wells may contain levels that are not safe.
==Health effects of arsenic==
