Just as fat accumulates and causes blockages in human arteries, oil and grease solidifies and accumulates in household pipes, restricting the flow of wastewater and causing sewer backups and overflows.
How it starts: Fats, oils, and grease (FOG) separates from other liquids as it goes down your drain. The FOG cools and sticks to household pipes and sewer pipes.
A matter of time: Over time, pipes become clogged and sewage flow becomes restricted.
Nowhere to go but back: The clogged pipe eventually backs up and floods your home with wastewater. Or it causes it to overflow onto the street.
Check out these facilities for disposal of larger quantities of FOG (e.g., used cooking oil):