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Some studies have reported preliminary successes in using packets of chemicals for household treatment. Some mixtures combine arsenic removal with disinfection. One example, developed by the WHO/PAHO Pan American Center of Sanitary Engineering and Environmental Sciences in Lima, Peru (CEPIS), has proven successful in Latin America.

WHO’s Activities on Arsenic WHO’s norms for drinking-water quality go back to 1958. The International Standards for Drinking-Water established 0.20 mg/L as an allowable concentration for arsenic in that year. In 1963 the standard was re-evaluated and reduced to 0.05 mg/L. In 1984, this was maintained as WHO’s "Guideline Value"; and many countries have kept this as the national standard or as an interim target. According to the last edition of the WHO Guidelines for Drinking-Water Quality (1993):
Inorganic arsenic is a documented human carcinogen. 0.01 mg/L was established as a provisional guideline value for arsenic. Based on health criteria, the guideline value for arsenic in drinking-water would be less than 0.01mg/L. Because the guideline value is restricted by measurement limitations, and 0.01 mg/L is the realistic limit to measurement, this is termed a provisional guideline value. The WHO Guidelines for Drinking-water Quality is intended for use as a basis for the development of national standards in the context of local or national environmental, social, economic, and cultural conditions.
The summary of an updated International Programme on Chemical Safety Environmental Health Criteria Document on Arsenic published by WHO is available at http://www.who.int/pcs/ehc/summaries/ehc_224.htm#English. It addresses all aspects of risks to human health and the environment.
A UN report on arsenic in drinking-water has been prepared in cooperation with other UN agencies under the auspices of an inter-agency coordinating body (the Administrative Committee on Coor
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