How were detected contaminants evaluated for potential human-health concerns?
Concentrations of contaminants are compared to U.S. Environmental Protection Agency (USEPA) MCLs or USGS Health-Based Screening Levels (HBSLs); HBSLs were developed by the USGS and others as a first step towards understanding whether these concentrations may be of potential human-health concern. Concentrations of contaminants with MCLs are compared to their MCLs, and concentrations of contaminants without MCLs are compared to their HBSLs, when available. MCLs and HBSLs are referred to as human-health benchmarks in this study. Human-health benchmarks used in this study also included USEPA proposed MCLs for radon, and Safe Drinking Water Act action levels defined for copper, lead, and several other contaminants.
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