Prepared by GreaseTrapLocator · Fact review: August 18, 2026
Start with the interceptor type and the facility schedule
For covered food-service facilities connected to Portland's City sewer, the Bureau of Environmental Services administers the fats, oils, and grease program. Its rules distinguish hydromechanical grease interceptors from gravity grease interceptors, so identify the actual device before arranging service.
Hydromechanical interceptors must be cleaned at least every 30 days and gravity interceptors at least every 90 days. BES can set a more-frequent schedule for the facility, and that written schedule controls.
Use the City's accumulation guidance correctly
Portland says most interceptors need cleaning when FOG and solids reach 25% of the unit. Some high-efficiency hydromechanical interceptors can accumulate up to 75%. This guidance does not replace the applicable 30-day, 90-day, or more-frequent site schedule.
Make the maintenance report part of the service
A maintenance report must reach BES within 14 days after every cleaning. It records the cleaning date, pre-cleaning FOG and solids depth in each interceptor, defects, the name and signature of the hauler or other person maintaining the interceptor, and the disposal-site name and location.
A service provider can submit the report, but the facility operator remains responsible. Agree who will file it, obtain a copy, and verify the report is complete.
Confirm disposal and avoid prohibited additives
Collected material must go to a facility permitted to receive the waste. Portland prohibits additives, emulsifiers, enzymes, and biological agents used to break down FOG for discharge to the sewer. Source-control practices such as dry-wiping cookware and keeping used cooking oil out of drains help reduce avoidable loading but do not replace cleaning.
Confirm requirements before project changes
For new construction, redevelopment, kitchen tenant improvements, or changes in ownership, occupancy, or operation, confirm the FOG requirements with BES before work. When an interceptor is required, City rules call for a location that is safely accessible for inspection, cleaning, and FOG removal, with City approval before final permit inspection.
Compare written Portland service quotes
Portland's public rules do not set a standard service price. Compare written scopes for the device type and access, complete cleaning, inspection notes, report preparation and filing, waste destination, scheduling, after-hours terms, exclusions, and total price. BES encourages the Regional Preferred Pumper Program but does not make that program the only service option.
A practical facility checklist
- Identify whether the facility has a hydromechanical or gravity interceptor.
- Follow the 30-day or 90-day minimum and any more-frequent BES schedule.
- Arrange a complete maintenance report after every cleaning and verify it reaches BES within 14 days.
- Confirm the disposal destination can receive the collected waste.
- Do not use chemical, enzyme, or bacterial products to break down FOG for sewer discharge.
Frequently asked questions
How often must a Portland grease interceptor be cleaned?
Under Portland's FOG rule, hydromechanical grease interceptors must be cleaned at least every 30 days and gravity grease interceptors at least every 90 days. BES can set a more-frequent site-specific schedule, so follow the schedule for your facility.
Does Portland use a 25% grease and solids threshold?
Portland says most grease interceptors need cleaning when FOG and solids reach 25% of the unit. Some high-efficiency hydromechanical units can accumulate up to 75%. This does not replace the applicable BES cleaning schedule.
What report is required after a Portland cleaning?
A maintenance report must reach BES within 14 days after each cleaning. It includes the cleaning date, pre-cleaning FOG and solids depth in each interceptor, any defects, the name and signature of the hauler or other person maintaining the interceptor, and the disposal-site name and location. The facility operator remains responsible even if a service provider submits it.
Are additives allowed in a Portland grease interceptor?
No. Portland prohibits chemical, enzyme, and bacterial products used to break down FOG for discharge to the sewer. Use routine cleaning and source-control practices instead.
Official sources
- Portland BES — ENB-4.26 Fats, Oils, and Grease Removal Program
- Portland BES — Grease interceptors and maintenance
- Portland BES — FOG best management practices
Fact-checked August 18, 2026. Local rules, permits, and official guidance can change; confirm current requirements for the service address. General information only, not legal, plumbing, engineering, environmental, health, or safety advice.
Author: Grease Trap Locator Editorial Team
The Grease Trap Locator editorial team covers FOG compliance, grease trap maintenance, and commercial kitchen regulations across the US and Canada. Our guides are written for restaurant owners, facility managers, and food service operators who need practical, accurate information without the fluff.
Find local contractors who handle cleaning, pumping, and FOG compliance — in your area.