How often should a grease interceptor be pumped out?
Each facility shall have its grease interceptor pumped according to the following criteria: a. When the settled solids layer exceeds the invert of the outlet pipe (typically eight inches in depth), or; b. When the total volume of captured grease and solid material displaces more than twenty-five percent (25%) of the capacity of the interceptor, or; c. When the interceptor is not retaining or capturing oils and greases.
