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This fact sheet presents U.S. Geological Survey (USGS) results from sampling Central Columbia Plateau public supply wells for pesticides. In 1994, the USGS cooperated with the Washington State Department of Health (WDOH) in the first statewide assessment of the vulnerability of Washington public supply wells to pesticides. Samples were collected from 1,326 public supply wells across Washington State. In the Central Columbia Plateau, WDOH contract laboratories analyzed samples from 302 wells, while 138 duplicate samples were analyzed by the USGS using laboratory techniques that can detect very low concentrations of pesticides. Results were used by the WDOH for a risk analysis on which to base monitoring waivers, and by the USGS to assess the quality of ground water in the Central Columbia Plateau. Very low concentrations of pesticides were found in 45% of 138 public supply wells sampled in the Central Columbia Plateau. ●

Pesticides in Public Supply Wells of the Central Columbia Plateau