The study aims to investigate the impacts of rewards and motivation on employees' job satisfaction in Water Industry in Sultanate of Oman: Evidence from Diam Company. This study can provide Oman's policymakers that guides the Water industry to get employees' job satisfaction. The quantitative and inductive approaches have been implemented in this study. A study model was designed based on the literature, linking factors of rewards and motivation on job satisfaction. The data was collected with convenience sampling method through a Web-based questionnaire using Google Forms from 316 of Diam's employees. The analysis of collected data was performed through SPSS to test the model hypotheses of the study. The outcomes indicate rewards -either tangible or intangible- are influencing both employees' motivation and job satisfaction positively and significantly in Diam Company as public sector in Oman. The result shows the more rewards the employees received; the more employees' motivation and satisfied they will become. Besides that, the behavioral commitment of the employees' towards the organization increased accordingly, employees' handle their task accomplishment effectively and guide for organizational performance and high productivity. This study initiates an attempt to examine how rewards affecting employees' motivation and job satisfaction in Oman at Water Industry as there are a few research conducted in the same field in Oman. The study's findings can contribute to Water Industry's indicators to design their rules, policies, and organizational structures that give the employee space to work well and enhance the appreciation of their tasks' fulfillment and achievements. This will inevitably lead to organizational growth and success. Keywords: Diam, Public Sector, Motivation, Rewards, Job Satisfaction, Sultanate of Oman, Water Industry.