On April 10, 2024, United States Environmental Protection Agency (EPA) announced the final National Primary Drinking Water Regulation (NPDWR) for six (6) Perfluoroalkyl and polyfluoroalkyl substances (PFAS). EPA established legally enforceable levels for these PFAS. Public water systems must comply with these levels by April 26, 2029. This compliance date will require utilities to attain four quarters of samples prior to April 2029. In preparation for the competitive RFP process to select a design team, TNAW sampled its source water and has some results at the compliance threshold. Jacobs provided conceptual engineering and alternatives analysis to consider and recommend options for addressing future PFAS discharge limits at this surface water treatment plant. This presentation will provide an overview of the TNAW’s preparation for this project, and it will provide an in-depth summary of the study and results. As much as possible, depending on timing/schedule, an update will be provided on the implementation of these results with the next phase of the project. The Citico Water Treatment Plant (CWTP) is a 65 MGD facility located in Chattanooga, TN on the Tennessee River’s Nickajack Reservoir. The influent is sent through the screen house and low service pump station. The Citico Pump Station (CPS) houses both raw and high service finished water pumps. From there, the raw water is pumped to the raw water building where pretreatment chemicals are added. The flow then splits off into the two treatment trains (Plant 1 and Plant 2). Plant 1 is a 40 MGD conventional treatment plant including flocculation, inclined plate settling, filtration, and disinfection. Plant 2 has a capacity of 25 MGD and includes eight Aldrich Treatment Units. These Aldrich units include the clarification and filtration steps inside an individual tank. Filter effluent from the two plants is collected in two clearwells 2 & 3 and conveyed to high service pumping at the CPS. Backwash waste from Filter House 2 (Plant 1) and the Aldrich units are conveyed to decant basins. Residuals from the settling process & dewatering are sent to thickeners. The solids are thickened and dewatered and transferred offsite for disposal. The liquid from the backwash decanting and dewatering process is recycled to the head of the plant and or to the municipal wastewater system. The primary goals of the study include the following: ?Evaluate feasibility of PFAS treatment technologies, including GAC, IX, RO, and emerging technologies. ?Develop design criteria for alternative PFAS treatment technologies. ?Provide conceptual level treatment layouts. ?Develop non-economic criteria for PFAS treatment alternatives. ?Develop conceptual cost estimates for each PFAS treatment alternative. ?Develop preliminary project schedules for recommended alternative. Results of the study include decisions and criteria for TNAW to move forward with acquiring a design build team to implement the solution to meet the future regulations. The recommend solution includes: ?50 MGD Granular Activated Carbon (GAC) Gravity Contactor Facility ?Demolition of meter shop & administration building ?Booster pump station & yard piping ?Revision to chemical injection locations