Our Engineering Department also has responsibility for working with commercial establishments in managing grease in the wastewater system through Grease Trap Inspections. Grease clogs pipes and can damage system components. We also strongly recommend that residential customers take care with grease disposal, especially in colder months. Grease will clog the homeowner’s plumbing system, which can result in significant expense. Residential grease can have a significant impact on the wastewater collection system.