Determination of Differences in the Quality of Groundwater and Treated Water of Najran City, Kingdom of Saudi Arabia

This paper aims to find out the major differences in the quality of groundwater and treated water at Najran City which lies in the southern region of Saudi Arabia. Physical and chemical analyses were conducted and used to determine these differences. The study and chemical analysis for groundwater (samples collected from bore holes), and treated water (samples collected from treated water stations), showed that ammonia (NH3), fluoride (F), and iron (Fe) are not detected in the water samples. The groundwater and surface water quality in the studied area is fit for drinking and other domestic uses as compared with the international drinking water standards. Also the study showed that, the treated water samples are fit for different uses except at Al Mishaliya which shows high nitrates content. Groundwater samples are very hard and high content of nitrates were recorded at Al Hayra.