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Fats, Oils, and Grease (FOG) FOG is of two types: (1) of petroleum or mineral origin; (2) of animal or vegetable origin. FOG of petroleum or mineral origin, called nonpolar FOG, can harm the biological phase of sewage treatment where microbes are used to break down wastes. The King County limit for nonpolar FOG is 100 milligrams per liter of discharged wastewater. Industries use oil and water separators to pretreat wastewater containing nonpolar FOG. Plans for separators must be approved by the local sewer utility or by King County Industrial Waste (KCIW). Information on plan submittal and installation guidelines is available on this Website in the Oil/Water Separator Fact Sheet (161 KB) prepared by KCIW. FOG of animal or vegetable origin, called polar FOG, can block sewer lines. King County rules require dischargers to minimize free-floating FOG. Wastewater must not be discharged if someone can see FOG floating on the surface or adhering to sides of storage containers. Dischargers may not add agents to emulsify free-floating polar FOG. King County may require companies discharging polar FOG to complete a FOG control plan. The goal of the FOG control plan is to implement reasonable and technically feasible controls of free floating FOG. The basic components of the FOG control plan should include: FOG Control Plans: The goal of the FOG control plan is to implement reasonable and technically feasible controls of free floating FOG. The basic components of the FOG control plan should include:
For food service establishments (i.e. restaurants, cafeterias, etc.), make
sure to check with your local sewer service provider regarding their requirements for polar FOG.
For additional information on polar FOG at food service establishments, consult:
“A Guide to Restaurant Grease
Management,”(pdf, 183 KB) and,
“A Pocket Guide to Best Management Practices for Restaurant Grease” (pdf, 52 KB) by the Interagency Regulatory Analysis Committee (IRAC) of the Local Hazardous
Waste Management Program in King County.
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