Prepared by GreaseTrapLocator · Fact review: August 17, 2026
Know which rule does what
Illinois plumbing rules require grease interceptors in covered commercial or institutional plumbing where grease, fats, or culinary oils are generated. Grease-bearing lines go to the interceptor, the equipment must be accessible, and food-waste-disposal discharge does not go to a grease interceptor.
Chicago food-establishment licensing guidance separately says manual dishwashing needs a three-compartment metal sink equipped with a grease interceptor. MWRD guidance explains regional FOG control, but that does not turn every restaurant requirement into one City FOG ordinance.
Confirm project and sewer requirements
Before installing, replacing, or changing a device, confirm the project with the City and the sewer authority serving the property. Use the actual plumbing design and authority direction rather than a generic device-size table.
Plan service without an invented Citywide schedule
The reviewed current sources do not establish a single numeric threshold or calendar cleaning interval for every Chicago food-service location. Inspect the actual device, follow manufacturer instructions, and comply with any written permit or sewer-authority direction. Keep itemized service paperwork and ask the authority what additional records apply.
Compare Chicago service quotes
No official Chicago contractor rate table was found. Compare written scopes for the device and access, full cleaning or pump-out, waste-handling paperwork, proposed service interval, scheduling, exclusions, and total price. Ask the provider to identify the credentials and disposal documentation that apply to the job.
A practical facility checklist
- Confirm the property is within City limits and identify the sewer authority.
- Use the Illinois plumbing requirements and City project direction for installation or changes.
- Do not import a numeric threshold or calendar schedule from another city.
- Inspect and service based on the actual device and written local direction.
- Keep itemized service and waste-handling paperwork.
Frequently asked questions
Do Chicago food-service locations need a grease interceptor?
Illinois rules require one where grease or culinary oil is generated in covered commercial plumbing. Chicago licensing guidance also identifies an interceptor for manual dishwashing. Confirm project-specific design with local officials.
How often should a Chicago grease interceptor be cleaned?
The reviewed sources do not establish one current Citywide numeric interval. Set the interval from observed accumulation, manufacturer instructions, and any written requirement from the sewer authority or permit.
What should I ask for in a Chicago service quote?
Identify the device and access, full work scope, waste-handling paperwork, proposed interval, scheduling, exclusions, and total price in writing.
Which authority should a Chicago operator contact?
City food and project requirements and regional wastewater roles differ. Start with the City for the business or project and verify the sewer authority for the exact property.
Official sources
- Illinois Plumbing Code — section 890.510
- City of Chicago — Food-establishment licensing requirements
- MWRD — Technical Guidance Manual, Article 8
Fact-checked August 17, 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.