Fats, Oils and Grease (FOG) Program


Fats, Oils and Grease (FOG) are by-products of many foods and are used inthe cooking of food.  Grease is the common term for animal fats and vegetable oil.  Grease can be found in such food items as meat fats, lard, butter or margarine, cooking oil, shortening, food scraps and baking goods.

The Pretreatment Section's FOG Program is designed to limit and control FOG discharges from food service establishments and to provide educational information to users of the wastewater system.

The Pretreatment's FOG Program is to:

  • Protect public health by preventing exposure to disease causing bacteria,
  • Protect private property and the City's infrastructure from damage caused by Sanitary Sewer Overflows (SSO),
  • Protect the environment from harm caused by Sanitary Sewer Overflows, and
  • Ensure compliance with the City of Yuma AZPDES Permit.

The accumulation of grease within sanitary sewer collection lines increases the potential to create sewer blockages.  Sanitary sewer blockages can result in sanitary sewer overflows, which enter the environment, create blockages that cause wastewater to back up into business establishments, or homes that result in extensive damage.

In order to reduce sewer blockages, food service establishments discharging wastewater that contains FOG to the City of Yuma sanitary sewer system, must install and maintain a grease removal device, including traps and interceptors.  All traps and interceptors shall be maintained for continuous, satisfactory and effective operation by the owner, leaseholder or operator at his expense.  Best Management Practices for the control of Fats, Oil and Grease (as published by the City of Yuma) shall also be implemented by all  establishments that discharge FOG to the City wastewater collection system.

Homeowners and FOG

FOG is a byproduct of cooking that comes from meat fats, lard, oil, shortening, butter and margerine, food scraps, baking goods, sauces and dairy products.  FOG enters your plumbing system through home garbage disposals, kitchen sinks and dishwashers.  FOG coats the inside of your plumbing drain pipes.  It then enters into the City's wastewater system.

Think of FOG as "hardening of the arteries".  When cholesterol builds up in the human blood stream, it can cause a heart attack.  When FOG hardens in the plumbing system, it can eventually cause wastewater to overflow in your home or neighborhood streets.

What can residents do to prevent FOG blockages?

  • Never pour grease down sink drains or into toilets.
  • Scrape grease and food scraps into a cn or the trash for disposal.
  • Collect hot grease in an aluminum foil lined bowl.  Allow the grease to harden, remove foil and place in the trash.
  • Wipe and scrape excess FOG from plates, pots, pans, utensils and cooking surfaces before washing.