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Introduction: The nitrite and nitrate are considered as pollutant agents of ground water resource, which are currently entering the wastewater types their average, are increasing. In this study, changes in nitrate and nitrite in drinking water resources of Gachsaran are reviewed with GIS systems. Material and Method: In this cross-sectional study, the sampling and measurement of parameters was done based on the Standard method book, Overall the number 258 samples from 43 sources and results of 5 years Archived analysis in Water and sewage Co with GIS software version 9.3 and SPSS version 16 and Pearson correlation test was analyzed. Results: The results showed that, the concentration of nitrate from 5.15 (based on nitrate) in year of 2006 and nitrite from 0.01 in 2009 increased to 10.87 and 0.0157 (ppm), respectively in 2011. The minimum of nitrate concentration related to year of 2006 and their maximum was 11ppm (based on nitrate) in 2009 and local changes of nitrite and nitrate levels indicated that the studied area have high quality Compared to other areas. Discussion and Conclusion: According to the results, the concentration of nitrite and nitrate is increased during the past years. While the concentration of these parameters was less than determined National and international standards, but due to the risks of this elements must be prevented the increasing trend.

Keywords: Nitrite, Nitrate, Gachsaran, GIS

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