West Knox Utility District


What is FOG?

FOG is the acronym used to refer to Fats, Oils and Grease that enter the sewer system from homes, apartments, restaurants, and industry and public facilities.

As a byproduct of cooking, FOG is usually found in:

  • baking goods

  • butter, lard, shortening

  • cooking oil

  • fats and oil from cooked meats

  • food scraps

  • gravy

  • mayonnaise

  • salad dressings

  • sauces

  • sour cream

FOG can be classified into two different categories: residential FOG and commercial FOG. For more information on commercial FOG please click on the links below:

[Insert link to commercial FOG program]


Why is FOG an issue for me?

When FOG are poured down drains or in garbage disposals, they build up in our sewer systems and can back up in homes or manholes. These backups and overflows pose serious public health and environmental problems. Additionally, FOG increases the existing financial cost associated with the operation and maintenance of the sanitary sewer system.

EPA’s Report to Congress on combined sewer overflows (CSOs) and sanitary sewer overflows (SSOs) identified that “ grease from restaurants, homes, and industrial discharges into sources are the most common cause (47%) of reported blockages. Grease is problematic because it solidifies, reduces conveyance capacity, and blocks flow.”

By learning how to safely recycle or dispose of FOG, we are improving the health of our environment and the quality of life in our community.

The Do's and Don'ts of FOG


  • Place cooled oil and grease into trash bins or covered collection containers.

  • Be aware of the “hidden oils” such as salad dressings, cheese, cookies, pastries, sauces and gravies.

  • Scrape food scraps from dishes into trash bins.

  • Manually wipe off all visible fats, oils, grease and food residue from dishes and cookware into trash bins.

  • Use a strainer in the sink to collect excess food particles.

  • Clean up grease spills with absorbent material and place into trash bins.

  • Encourage neighbors to help keep fats, oils and grease out of the sewer system.


  • Don’t pour oil or grease down the drain.

  • Don’t scrape food scraps down the drain.

  • Don’t pour liquid foods (syrups, batters, gravy, etc.) down the drain.

  • Don’t run hot water over greasy dishes, pans or fryers – it will not prevent FOG from sticking to the inside of the pipes.

  • Don’t use chemicals to remove grease clogs; they can damage the piping system.

  • Don’t rely on a garbage disposal to get rid of grease. 

For more information about FOG and how it effects you please call:

Jason Trammell - OR - Dustin Bolen

865-690-2521 ext. 210