The New Mexico Bureau of Geology and Mineral Resources serves as the state’s geologic survey, and has been working in Peña Blanca since March 2016 at the request of the NM Environment Department (NMED). The goal was to understand the local hydrogeology of Peña Blanca in order to make a recommendation for an area to place a new well. The need for a new well was highlighted by the discovery of solid waste, a hydraulic fluid tank and a diesel tank immediately adjacent to but on different property than the current municipal well. We met our goal by reviewing the existing literature on the local and regional geology, historical studies of groundwater levels, and regional groundwater chemistry studies. We also collected measurements of groundwater levels and sampled water chemistry in 25 municipal and domestic wells in and around Peña Blanca.