Grease Control

The grease control program was instituted to address the problems associated with animal fat, oil and grease buildup and clogging of sewer lines. Grease accumulation in the sewer collection system is one of the major causes of sewer blockages and subsequent wastewater overflows. Based on available information, standards were set and procedures put in place for a grease control program.


Grease traps/interceptors are required for all food preparation establishments, which may contribute or cause to contribute, directly or indirectly, any wastewater that contains oil or grease. This includes, but is not limited to, restaurants, cafeterias, cafes, fast-food outlets, schools, fraternal organizations, churches, hospitals and daycare centers. Marietta Water's Environmental Compliance personnel currently inspect more than 315 facilities in the city of Marietta. 

The grease interceptor design and sizing criteria must adhere to the requirements established by Marietta Water and will be subject to approval. Marietta Water has adopted the sizing criteria developed by the Cobb County Water System. Grease traps/interceptors that are not able to comply with current standards may be subject to modification and/or replacement. Existing sources not connected to grease interceptors, or sources connected to in-line interior grease traps that contribute significant quantities of oil and grease wastes, may be required to install an upgraded grease interceptor.


Maintaining grease traps/interceptors is the sole responsibility of the owner or operator. The owner or operator must ensure proper operation to prevent obstruction, interference or damage to the collection system. All grease interceptors must be pumped dry and the contents hauled and disposed of by Environmental Protection Division-permitted commercial transporters. The use of bacteria or enzymes is not prohibited; however, they may not be used as a substitute for regular pumping of a grease interceptor. Grease interceptor pumping, at a minimum, must be completed every three months, unless more or less frequent pumping is required. Marietta Water's Environmental Compliance personnel have implemented an inspection program to ensure compliance.