In parts of the western United States groundwater used for drinking water contains high concentrations of metals, including arsenic. In a rural county in Nevada, USA, we measured concentrations of arsenic and tungsten and the proportion of arsenic occurring in trivalent form (As (III) ) in tap water samples from private domestic wells in 307 households. The proportion of arsenic occurring as As (III) ranged from 0 to 100% (ave. 21%, median 1% This suggests that householders in this area were likely to be exposed to both metals simultaneously, given that 253/307 of the respondents (82%) reported consuming tap water.
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