Fats Oils and Grease build up in pipes 2 What is F.O.G?

Fats, Oils and Grease, which are found in:

  • meats, butter, dairy products
  • gravies, sauces, salad dressings
  • fryer oil

Why is it a problem?

When you pour these down sinks and drains, they cool and congeal inside the sewer pipes. They mix with other solids. This causes clogged sewer lines and backups into homes and businesses.

This endangers public health. Cleaning and repairing the sewer lines is costly. These costs are paid by water and sewer customers, as well as the homeowners and businesses that caused the backups.

Watch this short video: What Lurks Beneath Your Drain by the South Coast Water District.

You might also enjoy these other videos:

Science test

Try this test on products that say "flushable wipes." Fill up two buckets of water and in one, place the "flushable wipe" in the other a piece of regular toilet paper. Let it sit for awhile and then see how hard it is to rip them apart. For something to be truly "flushable" it should rip apart easily when soaked in water.


Grease is the worst offender. The warm liquid pours easily down the sink, but cools and creates major problems through the water and sewer system, which can lead to shutdowns at the treatment plant, or backups in your home or business.

Grease reduces pipe capacity, which means piping systems must be cleaned, and sometimes replaced, more often than planned.

Pouring F.O.G. down the sink costs us money.

  1. FOG in the Wastewater System
  2. Reduce FOG at Home and Work
  3. Questions?

Fouled Air Release Valve -Redwood AreaAir Release Valve (ARV)

Air release valves at the high points of the pipeline are designed to release air pockets out of the line. This helps pumps and piping move the liquids more effectively.

Grease coats the air release valve. At some point, it finally plugs the valve. When this happens, the result is:

  1. The valve cannot let air out of the line. The pumps have to work harder and longer.
  2. It lets sewage into a carbon canister which should always be dry.

Grease costs the water and sewer customers and the Plant money in worn pumps and higher maintenance costs.

Vacuum Release Valve (VRV)

Red plastic float opens and closes the VRV assemblyThe yellow material is grease congealed on the red float on the release valve.

Grease clogged valves let sewage into the carbon canister. This 55 gallon canister filters the air releases to reduce odor. Odor increases when the canister is damaged.