Dissertation ( MA Public Administration)The study was conducted at Dodoma Urban Water Supply and Sanitation Authority which is located in Dodoma Region. The study attempts to examine the influence of sociocultural environment on OPRAS, a case study of DUWASA. A sample of 70 plus 9 key informants were included in the study which implicated both management staff and the floor workers from each department. Questionnaire, interviews and documentation were used to collect data. Questionnaires were given to ordinary employees while the departmental heads were supplied with interview questions in addition to questionnaire in order to obtain detailed information on key matters. Collected data were quantified, tabulated, summarized in tables and then were analyzed by means of statistical techniques. The scientific Package for Social Science (SPSS) version 16 was used in analyzing the data. The study reveals that, socio-cultural environment deplorable positive impacts on OPRAS including equality, increase morale to work, improve service delivery and improve the performance of the organization. Also the study revealed that there are some elements of favoritism, ethnic identities, religious and gender biasness which hinder implementation of OPRAS at DUWASA. Therefore despite of impressive results OPPRAS implementation is hindered by socio-cultural factors. It is then recommended that the government should consider socio-cultural environment when designing or adopting any performance assessment tools. Managers and employees should conform to acceptable social values, they must obey code of conduct that includes integrity, regard for others, keeping commitments, accountability and transparent.