For more information on the District's Grease Management Program please contact us at (206) 546-2494 or visit our office at 17505 Linden Ave. N, Shoreline, WA 98155.
A trap is a small reservoir built into the wastewater piping a short distance from the grease
producing area. Baffles in the reservoir retain the wastewater long enough for the grease to
congeal and rise to the surface. The grease can then be removed and disposed properly.
An interceptor is a vault with a minimum capacity of between 500 and 750 gallons that is located
on the exterior of the building. The vault includes a minimum of two compartments, and flow
between each compartment is through a 90 degree fitting designed for grease retention. The
capacity of the interceptor provides adequate residence time so that the wastewater has time to
cool, allowing any remaining grease not collected by the traps time to congeal and rise to the
surface where it accumulates until the interceptor is cleaned.