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Natural Background Groundwater Arsenic Concentrations in Washington State: Results of a Study


July 14, 2021 - Aug. 16, 2021, 11:59 p.m.

You're invited to comment on a study that evaluated natural levels of arsenic in Washington groundwater.

This report presents the results of a study begun in 2010 by Ecology’s Toxics Cleanup Program. The study evaluated natural background groundwater arsenic levels in Washington state, using data from more than 5,000 public water supply wells. “Natural background” means the arsenic was there naturally, not altered by human activity. 

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