As a result of multiple waves of administrative reforms in the past three decades, China's civil service has become more professionalized. Yet public employees appear to have become increasingly dissatisfied in recent years. Based on questionnaire surveys and interviews with environmental enforcement officials in a southern city, this paper traces changes in the job satisfaction levels of these officials between 2000 and 2014. It shows that satisfaction with the extrinsic rewards received and overall job satisfaction declined during this period. These downward trends partly reflected the increasingly challenging institutional environments faced by the officials: rising political and societal demands, inadequate fiscal and personnel resources, and limited enforcement authority. In addition, as the officials became more highly educated and professionalized, mission match became a stronger antecedent of job satisfaction. These findings suggest the importance of meeting the motivational needs of a more professionalized workforce.