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Background: 2TThe growing population and increasing needs to agricultural products increased use of pesticides resulting in contamination of the environment, including water. The purpose of this study was to 2Tdetermination2T of 2Tpesticide residues2T in agricultural water resources in Barzok city of Kashan in 2011. Materials and Methods: 2TThis study as a descriptive and cross-sectional study that was conducted at spring season. That totals of 135 samples of the agricultural water resources of Barzok were 2Tcollected2T randomly and mixtures from different stations. After extraction and preparation of samples, the 2Tpesticide residues2T were determined by using the HPTLC (High Performance Thin Layer Chromatography) devices and CATS4 software. Finally, obtained data were analyzed by using ANOVA statistical 2Tmethods2T. Results: 2TThe results of this study showed that maximum amount of diazinon and chlorpyrifos has been 22.43 and 11.79 ppm respectively, and the2T pesticide residues2T have declined gradually overtime of (p<0.001).Furthermore, after a month 95.9% of Chlorpyrifos and 88.8% of diazinon is degraded. Conclusion: 2TAccordingly, the remaining of diazinon and chlorpyrifos after a month of spraying was higher than determined limited standards. Because Chlorpyrifos is broken down rapidly more than diazinon, it is recommended that besides educating farmers on the proper use of pesticides, unnecessary contact with the water resources of this region must stop at least one month after spraying. [ABSTRACT FROM AUTHOR]