Abstract
Aflaj forms a significant water resource system in the Sultanate of Oman of which 92% is used for irrigation purposes while the rest is used for domestic works. Continous human interventions in this system are causing adverse effects on the natural flowing water quality before it can reach the end users. This research work assesses the quality of the Aflaj water system in the Wilayat of Samail, Sultanate of Oman. Also, various physical, chemical and biological parameters have been evaluated. It is concluded that the water quality is contaminated with biological content and needs proper disinfection to avoid adverse health issues in living beings.