Ground water geochemistry of the south Taos Valley

Groundwater in the South Taos Valley exhibits anomalous concentrations of fluoride, arsenic, chloride, and other ions, likely due to deep-seated faults channeling hot waters that mix with shallow aquifers. These findings, derived from a comprehensive sampling program by TSWCD staff and analyzed by the New Mexico Bureau of Geology and Mineral Resources, reveal elevated levels exceeding EPA drinking water standards—most notably at Ponce de Leon Hot Springs along the eastern fault bordering Miranda Canyon graben. Similar patterns are observed in domestic wells and near the Pecos-Picuris fault system, suggesting a geochemical link between subsurface faults and surface manifestations. The study also highlights surprisingly high total dissolved solids (TDS) in perennial streams, tapped by local acequia systems, underscoring potential implications for water quality and resource management.

Benson, A. L., & Gervason, R. (2011). Ground water geochemistry of the south Taos Valley. New Mexico Geological Society, 2011 Annual Spring Meeting, Proceedings Volume, Theme: “Manifestations of Mantle-to-Surface Connections in the Southwest”. https://doi.org/10.56577/sm-2011.583