Water is very important for the life, therefore the employee performance of water company should be excellent. The success of a company is strongly influenced by the performance of its employees. Employee performance is critical to organizational growth and profitability. This research was conducted at a government-owned water company in Surabaya, East Java, Indonesia with the aim of analyzing the effect of organizational commitment on employee performance, organizational commitment on job satisfaction, job satisfaction on employee performance and organizational commitment on employee performance through job satisfaction. This study uses 63 employees as a sample and questionnaire is used to obtained the information concerning with organizational commitment, job satisfaction and employee performance. Data analysis used Structural Equation Modeling (SEM) Partial Least Square (PLS). The results showed that organizational commitment affects employee performance, organizational commitment affects job satisfaction,  job satisfaction affects employee performance, and employee job satisfaction is able to mediate the relationship between organizational commitment and employee performance.