Cobb County Water System serves approximately 160,000 sewer customers throughout the county who collectively produce an average of 63 million gallons of wastewater each day. Wastewater (also known as sewage) is water after it is having been used for everyday activities like showering, cleaning, and flushing.  After use, the wastewater is transported via the collection system to a water reclamation facility (WRF) for treatment. These facilities clean the wastewater then return it to local waterways. 

The wastewater collection system includes over 2,600 miles of wastewater main lines, with pipes ranging in size from 8 inches up to 72 inches, 46 miles of force mains, with pipes ranging in sizes from 4 inches to 42 inches, and 31 pump stations. Some parts of the collection system are over 80 years old and still in service. To ensure the wastewater is conveyed to the WRFs through the collection system, our staff utilizes a variety equipment to include excavators, high-pressure water trucks, video inspection equipment and vehicles, and minimally evasive repair equipment. The collection system is operated and maintained by over 90 dedicated and licensed water professionals between 2 divisions working for Cobb County Water System.

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  Approximately 2,683 miles of wastewater collection piping
  • Most 8 inches in diameter
  • Up to 72 inches along the Chattahoochee River
  • Average daily sewage conveyed to the WRFs is 63 Million Gallons a Day
• Two deep rock tunnels
  • 18-foot diameter Chattahoochee Tunnel
  • 24-foot diameter South Cobb Tunnel