Nashville Metro Water Services (MWS) recently completed a comprehensive review and update of one of the primary documents guiding the Clean Water Nashville program. The Corrective Action Plan/Engineering Report (CAP/ER) and Sewer Master Plan Update, which was finalized and submitted for regulatory review in late 2025, provides the framework for extensive future investments in Nashville’s sewer system over the coming decades. The update also fulfills requirements under a federal Consent Decree with the U.S. Environmental Protection Agency (EPA) and the Tennessee Department of Environment and Conservation (TDEC) by describing efforts to address ongoing sanitary sewer overflows, ensure regulatory compliance, and plan for future growth across its extensive service area. The CAP/ER and Sewer Master Plan Update was developed through extensive system evaluation and hydraulic modeling, integrating updated system performance data, population growth projections, and development trends. It integrates more than a decade of system monitoring, modeling updates, and results of prior infrastructure renewal projects to guide the evaluation process. This presentation will provide an overview of that process, including how internal stakeholders were engaged, and it will illustrate the decision framework used to identify project needs, including: • Identification of problem areas using model predicted surcharging, field observations, and documented overflows; • Application of a structured hierarchy that prioritizes inflow/infiltration (I/I) reduction, followed by gravity sewer upgrades, pump station improvements, equalization storage facilities, and treatment expansions; • Evaluation of feasibility and constructability across diverse geographies; and • Integration of satellite (wholesale) user impacts into the alternatives evaluation. A significant portion of the presentation will focus on the recommended CAP/ER and Master Plan projects, highlighting representative examples from throughout the service area. These include projects that: • Reduce wet weather overflows through extensive sewer rehabilitation; • Address bottlenecks and plan for growth with targeted gravity pipe upsizing in key corridors and increased pumping capacity at key stations; • Deploy strategic equalization storage where other improvements are impractical; and • Consider limitations of existing water reclamation facilities and opportunities for expansion. Because many upstream solutions converge downstream, the presentation will also preview the forthcoming Mill Creek Trunk, Browns Creek Pump Station, and Central Water Reclamation Treatment study, which will evaluate integrated conveyance and treatment solutions, including expanded pumping, tunnel conveyance, and long term treatment capacity needs beyond 2050 for a large area of MWS’s system. By the end of the presentation, attendees will come away with a clear understanding of: 1. The general process used to evaluate Nashville’s sanitary sewer system; 2. The rationale behind the recommended improvements; and 3. How this plan positions MWS to meet both current regulatory obligations and the evolving needs of a growing metropolitan area.