Pretreatment equipment helps prevent sewage spills. The Fats, Oil, and Grease (FOG) Program is essential to the protection of your private lateral as well as the City of Escondido’s sanitary sewer system. FOG that enters a sewer pipe adheres to rags, roots, the walls of the pipe and other obstructions, which can block the wastewater flow and result in an overflow of sewage. Overflows can flood businesses and residences and harm the environment. Sewer repairs may be necessary if proper care is not taken to protect wastewater pipes.