Iranian Research Organization for Science and Technology Advances in Environmental Technology 2476-6674 12 2 2026 04 01 Drinking water quality assessment using water quality index: A case study of the Shahrekord, Iran 198 207 1661 10.22104/aet.2026.7932.2222 EN Ahmad Shirani Takabi Department of Chemistry, Faculty of Science, Shahrekord University, P.O. Box: 115, Shahrekord, Iran Mahboube Shirani Department of Chemistry, Faculty of Science, University of Jiroft, P. O. Box: 7867161167, Jiroft, Iran Abolfazl Semnani Department of Chemistry, Faculty of Science, Shahrekord University, P.O. Box: 115, Shahrekord, Iran Saeid Asadpour Department of Chemistry, Faculty of Science, Shahrekord University, P.O. Box: 115, Shahrekord, Iran Journal Article 2025 10 10 In recent years, the use of water quality indices (WQI) to ensure the safety of drinking water has expanded. In this study, the quality of drinking water in Shahrekord was investigated. This study involves measuring eight physicochemical parameters (pH, EC, TDS, TH, SO₄^2-, PO₄^3-, NO₃^-, Turbidity) of drinking water taken from the urban water network and calculating the water quality index. The obtained water quality index obtained for all water samples was below 50, indicating excellent and very good quality of Shahrekord's drinking water. After applying principal component analysis, the results indicated that first component, with the highest eigenvalue, is influenced by parameters such as sulfate, nitrate, electrical conductivity (EC), and TDS, confirming the salinity and chemical water quality are dominant. The second component, driven by phosphate, total hardness (TH), and turbidity, reflects the physical properties and hardness of water. The third component is associated with the contribution of phosphate and hardness. EC and TDS exhibit a high correlation. https://aet.irost.ir/article_1661_14aa3c5ebb674a7d5d3435230a3c0a8b.pdf