Public loyalty studies have focused primarily on showing loyal customers to tangible products and are often referred to as brand loyalty, while previous studies have not been concerned with general loyalty related to services. This study aims to suggest a conceptual framework for the relationship between service quality and public loyalty by the moderating effect of trust in the Jordanian Ministry of Water and Irrigation. A systematic literature review indicated that service quality had a positive direct effect on public loyalty. Moreover, a systematic literature review indicated that trust had a positive direct effect on public loyalty. This study presents a general view of what the Jordanian Ministry of Water and Irrigation needs to improve public loyalty.