Oil and water don’t mix. When Fats, Oils, and Grease (FOG) are put down the drain, they tend to adhere to the walls of pipes and to themselves. FOG will build up on the inner surface of pipes, harden over time, and cause blockages in a building’s plumbing, in the public sewer, or both. Blockages in the public sewer can have significant public health and environmental impacts. As such, the Sewer Department spends considerable resources regularly cleaning pipes affected by FOG. Stopping it at the source is a much more efficient way to prevent blockages.
In cases where small amounts of FOG are used (for instance, in a residential setting) it should be cooled and placed in the trash. For establishments that produce larger amounts of FOG (restaurants, cafeterias, bakeries, etc.) grease traps or grease interceptors are required to prevent FOG from causing blockages further downstream. The Sewer Department routinely inspects these grease traps and grease interceptors to ensure they are being maintained properly and working to keep FOG out of the sewer. Properly maintained grease traps and grease interceptors protects public health and the environment, and saves users money by reducing sewer bills.