The present paper investigates the study of physical and chemical properties of the Euphrates River water, purification
station water and network water (drinking water) in Al-Samawah city. In this study ten sites have been selected in January, 2019.
The parameters measured were temperature, color, taste and smell, turbidity, total solids, dissolved solids, suspended solids,
electrical conductivity, PH, total hardness, calcium, magnesium, free chlorine, chlorides, sulfates, total phosphates and
Biochemical oxygen demand (BOD). The results of the study showed that the pH tends to be neutral in river, purification station
and network water. The water is colorless and tasteless and odorless, and the values of total and dissolved solids and turbidity have
decreased significantly in the water of the purification station and the network compared to the raw water of the river. The sulfate
also decreased from 250 mg/L in river water to between (239-242, 235-246) mg/L for water of station and network, respectively,
and the concentration values of total hardness, calcium, magnesium and chloride showed a differential change between river water,
station and the network. The values of free chlorine were between (2.3-1.3) mg/L in the network water. The values of pH, solids,
turbidity, calcium, magnesium, chloride, sulfates and phosphates were within the permitted standard specifications of the World
Health Organization, while the values of electrical conductivity, total hardness and free chlorine, and the biochemical oxygen
demand for oxygen in water of station and the network were slightly higher. The values of the BOD fall within the good
classification of drinking water and household uses defined by the Iraqi standards and the World Health Organization (WHO).
Key words: Purification station water, network water, Al-Samawah city, physical and chemical properties, BOD.
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