The population centers in Alamogordo, Carrizozo, La Luz, and numerous other small communities, are largely supported by groundwater resources. With few perennial streams in this closed basin, water is sparse. Fresh water resources are limited, and recharge to these areas originates within the high elevation watersheds in the Sacramento Mountains, as precipitation, stream and spring flow. This goal of this study was to improve understanding of the groundwater resources in this region by identifying recharge areas and quantities, determining groundwater flow rates and direction, and to interpret the groundwater/surface water interactions that exist in the region. Methods used in this effort included geologic mapping, groundwater level measurements, and geochemical analyses of the groundwater, springs and streams.