Interactions Between SDG 6 and Sustainable Development Goals: A Case Study from Chenzhou City, China’s Sustainable Development Agenda Innovation Demonstration Area

Achieving the United Nations 2030 Sustainable Development Goals (SDGs) is a critical global challenge. Ensuring the sustainable utilization of water resources has long been a key policy priority for the Chinese government, balancing economic growth with ecological conservation and advancing ecological civilization. Taking China’s sustainable development agenda innovation demonstration area Chenzhou as the object, this work focuses on SDG6 and examines the progress in sustainable water resource utilization from 2015 to 2022, evaluating three dimensions—water quantity, water environment, and water ecology. A comprehensive evaluation index system closely related to SDG6 was constructed to assess the sustainable development progress. Furthermore, the interactions between SDG6 and related SDGs were analyzed. The results show that (1) from 2015 to 2022, the SDG6 composite index has significantly increased over time, with the establishment of the demonstration area (2019–2022) more than twice compared to before (2015–2018), particularly in water environment and water quantity; (2) the SDG composite index and individual SDG indexes have shown a fluctuating upward trend, with an increase of about 89.74% after the establishment of the demonstration area (2019–2022) compared to before (2015–2018), with the most significant progress in the society dimension; and (3) there were significant synergy effects between the improvements in SDG6 and related SDGs. For each unit increase in SDG6, the overall level of related SDGs increased by 0.73 units, specifically, with particularly strong synergies between SDG2, SDG7, SDG9, and SDG11. This study not only provides scientific guidance for water resource management and policy optimization in Chenzhou and similar water resource-based cities but also offers valuable localized case studies, methodologies, and data to support the monitoring of urban sustainable development at a global scale.