Background & Objectives: Ardabil city with population of about 340386 is still supplied with groundwater resource for drinking. That should have optimum quality standards in different aspects. If a drinking water physicochemical parameters levels is higher than the permitted recommended levels, they may create irreversible damages. This study intended to determine the physicochemical parameters of drinking water in Ardabil in the year 2004.

  Methods: This is a descriptive cross-sectional study that has been done on 35 samples of Ardabil city drinking water resources in 2004. Most of the physicochemical parameters due to their importance and present limitations or even through technical restriction in water and wastewater laboratory of Ardabil health care centers were chemically analyzed and the results were statistically analyzed and compared by 1053 country standard methods.

  Results: According to the results of analyzed samples and their comparison with their related standard, it is estimated that So₄, Po₄ and total hardness of samples were %9, %71 & %41 respectively more than maximum acceptable level. Fluorine of samples was %57 less than the minimum recommended fluorine.

  Conclusion: Due to the lack of consistency in the values of So₄, Po₄, fluorine and total hardness of testing samples with the related standards, programming for obviation of the problems seems essential.