Abstarct: Increasing population and more needs to water has attracted researchers attention to other water resources. The aquifers in the hardrocks are one of the important sources in arid areas where alluvial aquifers are not available. In this study volcanic belt of Torud – Chahshirin located in the south of Shahroud, has been selected to evaluate the geochemistry of water resources. This volcanic belt is very important because it is the only resource of water for the surrounding villages. Two sampling period were done in February 2017 and July 2018 of the existing water resources, in which 34 samples were collected for different experiments. In the first period, concentration of major anions and cations were investigated. The investigation of spatial changes shows the increases of electrical conductivity and temperature along the flow path. The pH value of the highland water resources is further reduced to lower elevations due to dissolution of sulfide minerals along the flow path. Temporal changes of the major ions indicate that the concentration of cations in February is more than July. The concentrations of anions were also measured low in February. According to the Scholler and Piper diagrams the water types, were Na-SO4. Investigation of the results of heavy mextals regarding to the World Health Organization (WHO) Standards indicates that the concentration of the all elements, except selenium in the Siyang sample, is lower than the standard permisble limit. The isotopic studies have been conducted, indicating that groundwater from the volcanic belt is similar to the local rainfall, which indicates that the regional water resources are originated from the current atmospheric precipitation.