Missoula FOG & grease interceptor rules
Concrete City of Missoula Wastewater Division Pretreatment Program requirements for food-service establishments and FOG pretreatment devices.
FOG-device installation
Requirement: Users identified as having potential to generate grease must install a gravity or hydro-mechanical grease interceptor.
Official text: "All Users positively identified above as having the potential to generate grease shall be required to install a Gravity Grease Interceptor or a Hydro-mechanical Grease Interceptor."
Fixture connections and licensed installation
Requirement: FOG-producing kitchen fixtures must connect to the gravity interceptor, and gravity interceptors/plumbing must be installed by a licensed plumber or contractor.
Official text: "All sinks, floor drains, floor sinks, mop sinks, disposals, dishwashers (except high temperature dish washers) and other plumbing fixtures in kitchens, bars, bussing stations, and other food service areas into which wastewater containing FOG may be introduced must be connected to the GGI."
Gravity-interceptor maintenance frequency
Requirement: Gravity grease interceptors must be serviced at least every 90 days or more often to keep accumulated FOG and solids at or below 25% of capacity.
Official text: "A GGI shall be serviced at a minimum of every 90 days or more frequently as needed to ensure that the total accumulation of FOG and settled solids does not exceed twenty-five percent (25%) of the GGI’s total capacity."
Maintenance records
Requirement: Maintenance, removal, and hauling records must remain on site and be accessible for at least three years.
Official text: "All records, receipts, and manifests of GGI maintenance, removal of GGI contents, and off site hauling of FOG waste including waste grease bin (WGB) contents shall remain on-site and accessible for review by City personnel for a minimum of three (3) years."