What concentration levels were measured?
Recent advances in laboratory analytical methods have given scientists increasingly refined tools to detect a wide range of chemicals in the environment at low concentrations. In particular, the analytical methods used in this study have low detection levelsoften 100 to 1,000 times lower than state and Federal standards and guidelines for the protection of water quality. Detections of contaminants, therefore, do not necessarily indicate a concern to human health, but rather identify the environmental presence of a wide variety of chemicals, some of which are not commonly monitored in water resources. These findings complement ongoing drinking-water monitoring required by Federal, state, and local programs, which focus primarily on post-treatment compliance monitoring of contaminants regulated by USEPA in drinking water. Many of the chemicals analyzed by USGS are not included in other source water and finished-water monitoring programs.
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- What concentration levels were measured?
