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Background & Objectives: one of the important factors in water quality control is corrosion and scale-forming potential. Scaling in pipes can cause sedimentation and reduction of water flow in pipes. As a result, more energy is required for water conveying. The aim of this study was evaluation of chemical quality about corrosiveness and scaling of drinking water in Bojnurd water distribution network. Methods and materials: this cross-sectional study was conducted in winter of 2012 and spring 2012. 30 samples were picked randomly from public water network taps. In order to determine the saturation indices, all samples were analyzed for various parameters. Three indices including Langelier saturation index (LSI), Ryznar saturation index (RSI) and Puckorius index (PI) were determined. Result and discussion: according to Langelier, Ryznar and Puckorius indices 93.3, 40 and 86.7 percent of samples were scale forming respectively. The results of this study showed that there is significant different between average Ryznar, Langelier and Puckorius in first and average Langelier, Ryznar and Puckorius in second step. Conclusion: based on obtained results, water of distribution network in Bojnourd is relative According to our results, water of distribution network in Bojnurd is relative scaling. Water scale-forming can cause reduction the pipe diameter, reduction flow rate, and economical damages. It is recommended to prevent these problems, take control measures to prevent sedimentation.