Many cities are facing combined sewer overflow (CSO) challenges due to intensifying federal and state regulations and increased attention on public health impacts. Municipalities across the country are exploring multiple alternatives to reduce the frequency of CSOs and, while there is no one-solution-fits-all approach, the complexities of the Ship Canal Water Quality Project offer insights into planning, design and implementation. Additionally, there is an added twist of improving sustainability across social, economic and environmental aspects, as evidenced by the project’s use of Envision. This webinar describes the process for implementing this large-scale CSO tunnel solution, focusing on sustainable components such as the importance of integrated agency and community planning-level considerations, integrating the project with and supporting surrounding infrastructure, finding innovative opportunities to improve sustainable performance, and using Envision to influence design, implementation and policy. Although this is a CSO solution on a large scale, the decision-making process and sustainability-driven conversations are applicable and transferable to projects of various sizes and locations.