System Performance

The Metropolitan Sewer Subdistrict Commission and staff believe that a well planned and executed collection system operation and maintenance program provides the foundation for future growth and development within the district. Metro’s program is designed to protect the local water quality and public health by reducing sanitary sewer overflows and system backups. In addition, Metro’s effective operations help to reduce and delay the need for expensive capital improvements to provide additional wastewater treatment plant capacity.

Our staff provides all routine pipeline operations, maintenance, and system evaluation. Work orders and reports generated during these activities are entered in MetroConnects’ asset management program Cityworks, enabling Metro to assess the collection system’s operational condition and requirements.

Metro’s program of operation and rehabilitation complies with the regulations of the South Carolina Department of Health and Environmental Control (SCDHEC), the guidelines and intent of the Environmental Protection Agency (EPA), Region 4 Capacity, Management, Operation and Maintenance (CMOM) Program and includes the following:

  • Capacity Assurance Program — Evaluates existing capacities of gravity sewer mains and pump stations. Metro’s program meets the requirements of SCHEC’s Regulation R.61-67, Standards for Wastewater Facility Construction.
  • Operations and Maintenance Program — Provides goals or milestones established each year by Metro’s Operations and Maintenance based on the results of the previous year’s efforts and accomplishments.
  • Sewer System Evaluation Survey — Provides a condition rating of Metro’s assets through smoke testing, manhole inspections, closed-circuit televising, and capacity evaluation.
  • Geographical Information System/Maintenance Management System (GIS/MMS) — Provides up-to-date documentation for defining collection system inventory and work history, which supports the condition rating and assets management system.
  • Flow Monitoring Program — Established to address and reduce inflow and infiltration (I/I) within Metro’s collection system, flow monitoring allows Metro to report and calculate its I/I reduction annually (weather permitting).


Metro utilizes a consulting engineer to review Sanitary Sewer Evaluation Survey data obtained by Metro staff to assess the conditions of Metro’s sanitary system. Using this information, Metro is able to prioritize repairs and identify rehabilitation projects. These projects are budgeted and advertised for construction. When information indicates the necessity for immediate or emergency repair or replacement of pipelines or appurtenances, Metro calls upon our yearly maintenance contract to complete the repair.

Metro’s commitment to continue to provide the highest level of operation and maintenance is illustrated by our sustained planning and funding of collection system rehabilitation projects. On average, Metro spends about $2 million per year on rehabilitation. Our future financial planning dedicates $2 million per year for the next 10 years to accomplish our collection system rehabilitation goals.