Grease interceptor means an interceptor whose rated flow exceeds 50gpm or has a minimum storage capacity of 750 gallons or more and is a device located underground and outside of a facility. It is designed to collect, contain or remove food wastes or grease from the wastewater while allowing the balance of the liquid waste to discharge to the wastewater collection system by gravity.

If the grease is not removed periodically the grease will work itself into the sewer system. Once grease enters the drain lines, it will clog and cause failure and a possible overflow.