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3. United States Environmental Protection Agency, National Primary Drinking Water Standards, 2003 (available in http://www.epa.gov/safewater).
4. World Health Organization (WHO), Guidelines for Drinking Water Quality, First Addenndum to Third Edition, Geneva, 2006.
5. Directive 98/83/EC, 1998, Official Journal of the European Communities L-330 (5th December, 1998), Council Directive (3rd November, 1998) relative to the quality of waters intended for human consumption.