Fats, Oils and Grease

Fats, Oils, and Grease (FOG) are an expensive and unsanitary problem in our sewers. FOG comes from food scraps, meat fats, lard, oil, margarine, butter, baking goods, sauces and dairy products. While it's unlawful to improperly discard these substances, it's also harmful to the environment. The majority of FOG in our wastewater (sewer) system comes from restaurants and other food preparation establishments. However, we can all do our part to minimize and eliminate FOG in our sewers.

The Problem:

When Fats, Oils and Grease (FOG) are washed down sinks, floor drains or are otherwise improperly discarded, clogs are formed. In time, these clogs can cause sewer backups to occur. These backups are costly to repair, harmful to the environment and can potentially cause health hazards. FOG leads to increased sewer maintenance and wastewater treatment costs, which ultimately means increased costs for customers.

Sanitary Problems:

Sewer backups and clogs attract insects and vermin, which create health hazards for everyone. These backups and clogs can also cause sewer overflows which result in a release of untreated sewage into our neighborhoods and waterways.


It is against the terms and conditions of Citizens Energy Group for any person to discard FOG by any means that allow it to enter our sewers.

In addition, restaurants and other food preparation establishments are required to install grease interceptors (commonly known as grease traps). These grease interceptors are to be installed in the waste line leading from plumbing fixtures or equipment where grease may be introduced to the sewer system. Grease interceptors must be properly sized and regularly maintained. Poor maintenance of grease interceptors is a major cause of the FOG problem in our sewers.


Citizens must respond to grease blockages in the sewer in an aggressive manner to restore and maintain sewer service to all affected users. Our response includes removal of FOG blockages, investigating to identify the source of origin and may result in enforcement actions such as fines and penalties, as well as cost recovery associated with removing FOG blockages and sewer cleaning.

What You Can Do:

Everyone can take steps at home and work to prevent FOG from entering our sewers.

  • Never pour fats, oils or grease into drains or flush down toilets.

  • When cooking, pour any fats, oils or grease into an empty jar. These materials solidify when cooled. Once the jar is full, secure the lid and put it in the trash.

  • Do not pour grease into your garbage disposal. Put the remaining food on plates and disposable utensils in the trash.

  • For restaurants, or other food preparation establishments, FOG can be a valuable resource as a recyclable. FOG can be sold to rendering companies for use in soaps, fertilizers and animal feeds.

Other Resources:

More tips on how to reduce FOG are available on the following fact sheets:

pdf  FOG for Residents

pdf  FOG for Restaurants

pdf  Grease Trap Info

The Marion County Health Department has developed Best Management Practices (BMPs) for the operation and maintenance of grease traps and grease interceptors. These BMPs require:

  • Monitoring outside grease traps regularly and cleaning them when FOG reaches 25% of the grease trap depth. Monitor inside grease traps monthly and clean them at least once every three months.

  • Disposing of waste cooking oil (deep fryer oil) through an established recycling company and never down the drain.

  • "Dry wiping" pots, pans and dishware prior to dish washing to minimize the discharge of FOG and solids.

  • Disposing of food wastes by solid waste removal or composting rather than using garbage disposals.

  • Verifying all grease interceptors cleaning and maintenance activities by a manager or supervisor to ensure that the device is operating properly.

  • Keeping a log of maintenance activities to help demonstrate compliance with the use of best management practices.