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Concentrations of drinking water arsenic in Antofagasta, Chile, 1950–2010. New water sources with high levels of arsenic were used from 1958 onward, and a water treatment plant for arsenic removal was installed in 1970, with improved removal efficiency thereafter. The current concentration of arsenic in drinking water in Antofagasta is below the World Health Organization standard of 10 μg/L (21).
