Sustainability has recently been acknowledged as a crucial issue in infrastructure projects. Developing a model to evaluate project\nsustainability according to sustainability indicators plays a major role in promoting the sustainable development of water\nenvironment treatment public-private partnership (PPP) projects. Traditional sustainability assessments are mostly based on the\ntriple bottom line (economic, social, and environmental) and lack a more integrated indicator system. To connect the research gap,\nthis paper identifies 27 factors that affect the sustainability of water environment treatment PPP projects from five dimensions:\neconomy, society, resources and environment, engineering, and project management using exploratory factor analysis. )e fitting\ndegree between the model and original data is verified by confirmatory factor analysis. The results showed that the fitting was\nsuccessful. This paper makes two contributions: first, it provides a comprehensive sustainability evaluation indicator system from\nfive aspects, laying a foundation for the evaluation of project sustainability. Second, this study defines a methodology to evaluate\nand rank factors, identifies the indicators that show the most significant impact on project sustainability in the five dimensions,\nwhich provide a reliable reference for the public and private sector to take appropriate measures to improve the sustainability level\nof water environment treatment public-private partnership projects.
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