“…The normality of the data was examined by using the histogram. Then, zoning of the groundwater quality was done using three interpolation methods of IDW, Radial Basis Function and ordinary Kriging methods, as in the study of Zahedifar, Mousavi and Rajabi who used Ordinary Kriging for the zoning of groundwater quality [40][41][42][43][44][45][46][47][48][49][50][51][52].Then, based on the lowest Root Mean Square Error RMSE and Mean Error ME values, the best interpolation was selected. However, results showed that in some of the interpolations, concentration ranges exceeded the minimum and maximum values.…”