One of the important factors in the sustainability of a region's development is the availability of adequate and suitable water resources for various uses, which, in addition to quantity, should be suitable from a qualitative point of view. Groundwater resources are one of the most reliable sources of water supply, which has suffered in recent years due to increased harvesting. The aim of this study is to evaluate the quality of groundwater in Sari-Neka study area and zoning of this area for agricultural use. In this study, 65 water wells in this area were chemically analyzed in year 1392-93. The samples were examined for the effective parameters in agriculture including chlorine (Cl), electrical conductivity (EC), acidity and alkaline (PH), sodium carbonate (RSC) residue. Finally, the water quality status was evaluated using the Wilcox index and the qualitative zoning map was considered. The results showed that more than 90% of the quality water test samples of wells used for agriculture in the C3-S2 and C3-S1 classes are located.