Public Comment Form

Commenting open: July 15, 2021 12:00AM PT - August 16, 2021 11:59PM PT.

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


You are invited to comment on a draft report that presents the results of a study begun in 2010 by the Washington State Department of Ecology’s Toxics Cleanup Program: Natural Background Groundwater Arsenic Concentrations in Washington State: Results of a Study (Draft for Public Comment)


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 not altered by human activity. It is defined in the Model Toxics Control Act (MTCA) Cleanup Rule as “…the concentration of hazardous substance consistently present in the environment that has not been influenced by localized human activities.” (WAC 173-340-200).


Comments will be accepted through Monday, August 16, 2021.









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