New Mexico Geological Society Annual Spring Meeting — Abstracts

In arid and semi-arid regions such as New Mexico, brackish groundwater represents a critical yet underexploited resource. This study presents a comprehensive assessment of the quality of New Mexico’s brackish water across diverse aquifers, utilizing advanced analytical methods to characterize its chemical, organic, and radiological properties. Groundwater samples were collected from 19 representative sites and analyzed for general water quality parameters (e.g., temperature, pH, conductivity, dissolved oxygen, TDS, TOC), major cations and anions, dissolved organic matter (DOM) via fluorescence excitation-emission matrix (FEEM) analyses, target organic compounds-including both volatile and semi-volatile organic compounds-and per- and polyfluoroalkyl substances (PFAS). The results reveal significant spatial variability influenced by both natural geochemical processes and anthropogenic activities. Notably, high levels of dissolved salts, variable concentrations of trace metals (such as aluminum, iron, and boron), and elevated organic carbon content were observed. Furthermore, radionuclide analyses showed low uranium concentrations but considerable variability in gross alpha, gross beta, and naturally occurring radium isotopes, reflecting mineral leaching and radioactive decay processes. PFAS analyses indicated the presence of shorter-chain compounds, while longer-chain PFAS were generally below detection limits. These findings highlight both the challenges and the potential of harnessing brackish groundwater in New Mexico. The study underscores the need for comprehensive monitoring programs and targeted treatment strategies to ensure the safe and sustainable use of this valuable water resource.