Characterization of Carcinogenic and Non-Carcinogenic Metal(loid)s in Water Within a Uranium-Mining-Impacted Region in Northwestern New Mexico, USA

More than 500 unreclaimed mines and about 1100 associated waste sites remain on the Navajo Nation as a result of uranium (U) mining. This study evaluated the impact of U-mining water contamination in a region of Northwestern New Mexico. The goal of this study was to determine historical baseline concentrations of selected metal(loid)s: those found to be highly associated with cancer (arsenic (As), cadmium (Cd), lead (Pb)) and other associated metals: cesium (Cs), molybdenum (Mo), selenium (Se), thorium (Th), U, and vanadium (V), using inductively coupled plasma-mass spectrometry. Cadmium drinking water concentrations (10.64 μg/L) exceeded the United States Environmental Protection Agency Maximum Contaminant Levels (MCLs) of 5 μg/L. Overall, water mean concentration levels were 11.04 μg/L of Pb, 4.21 μg/L of As, 3.53 μg/L of U, 278.67 μg/L for Mo, 21.70 μg/L for V, 2.39 μg/L for Cs, and 7.75 μg/L for Se. These findings underscore the importance of improving access to safer water sources and highlight the need for continued environmental monitoring and research on exposure pathways associated with carcinogenicity and other negative health outcomes.