Central Waste Water Treatment Plant Improvements & CSO Reduction Project – Nashville MWS



Treating 270 million gallons of wastewater a day, Central is the largest of three wastewater treatment plants (WWTP) that Metro Water Services (MWS) operates in Nashville. As a part of an ongoing effort to reduce combined sewer overflows (CSOs) and upgrade aging infrastructure, the capacity of Central WWTP is being increased to accommodate future flows from downtown Nashville’s combined storm and sanitary sewer system.


As a part of a diverse project team, Wilmot was tasked with ensuring that Metro Water Services’ sustainability goals are achieved in all aspects of the project. Utilizing the framework of the EnvisionTM rating system, Wilmot is developing a sustainability plan that meets current needs while ensuring that a growing Nashville continues to thrive well into the future. Some innovative aspects of this project include:

  • Extensive reuse of existing tankage and infrastructure that will reduce cost and environmental impact by eliminating the need to construct new facilities;
  • Dramatically increasing treatment capacity to ensure the Cumberland River is cleaner than it has been since Nashville industrialized;
  • Installation of energy efficient process equipment that will result in lower energy costs and associated pollution resulting from power generation;
  • Replacement of chlorine disinfection with safer ultraviolet disinfection;
  • The addition of greenway trails, community parks, and landscape improvements around the plant perimeter that will increase value and recreational opportunities for the surrounding communities of Salemtown and Germantown.