srjalsSRJALSSRJALS2788-9386https://doi.org/10.47310/srjals.2022.v02i02.001Evaluation of Efficiency of Drinking Water Treatment Plant in AlAziziyah City, IraqWisamThamerAl-MayahDepartment of Basic Science, College of Dentistry, University of Wasit, IraqDrinking water plays a great role in human Life. It must be within special specifications and standards. In addition, found many drinking water pollution problems in various areas of Al- Aziziyah City, Wasit governorate. The study objectives were to show the suitability of drinking water produced from basic filtration projects and compare it with the Iraqi and international standard for drinking water in order to investigate potential contamination. Therefore, physical, chemical and biological tests of drinking water were conducted at the drinking water treatment in the city of Al- Aziziyah City, Wasit Governorate from October 2020 to September 2021.for year. The samples were measuring the values and concentrations of water indicators. Water temperature was between 11-33°C and the turbidity values ranged 3-75 NTU, while the electrical conductivity values were between 939-1316 µS/cm. The values of the dissolved solids were 600.96-842.24 mg/L. The pH values recorded 7.1 - 8.1 with varying values of residual free chlorine 0.3- 3.5 mg/L. It was found that drinking water is hard. The total hardness values ​​were 389–510 mg/L and as for the values ​​of sulfate, they record 328 - 425 mg/L. For biological factors, the highest average of total bacterial numbers appeared in site R (raw water) during January 2021. It is reaching 450 cells/1 mL, while the lowest average in site E (water after treatment). It is also during March 2021 and it was zero cells/ 1 mL. The numbers of Escherichia coli bacteria, it was 0-340 cells/100 mL. About the drinking water produced from liquefaction projects, the results of the study showed that the values and concentrations of electrical conductivity, pH, dissolved solids and the standard specifications of Iraqi and international drinking water for all sites. The results showed that the concentrations of turbidity, free chlorine, total hardness, sulfates and total numbers of bacteria and E. coli bacteria in this study did not match the standard specifications of Iraqi [1] and international standards [2].