Grease Trap/Interceptor Permit in Chicago, Illinois (2026)
Without a Grease Trap/Interceptor Permit from the Chicago Department of Water Management, your restaurant risks sewage backups, fines, and closure—and your landlord may freeze your lease. This permit (also called a grease interceptor or FOG separator approval) certifies that your kitchen's wastewater treatment system meets Chicago's plumbing and environmental standards. 25 fields to complete; ApronPrep auto-fills 21 of them. Government filing fees vary—contact the Department of Water Management for the current fee structure. Most applicants complete this form in under 15 minutes with ApronPrep.
Analyzed from Grease Trap/Interceptor Permit
84% from one compliance interview
Manual entry or document upload required
Why You Need a Grease Trap/Interceptor Permit
Chicago food service establishments that discharge fats, oils, and grease (FOG) into the municipal sewer system are required to install and permit a grease trap or interceptor under the Chicago Municipal Code, Title 11 (Utilities), which governs sewer use and grease discharge limits, enforced by the Chicago Department of Water Management (DWM) in coordination with the Metropolitan Water Reclamation District of Greater Chicago (MWRD). Any commercial kitchen — including restaurants, cafeterias, food trucks with fixed connections, and catering facilities — must obtain a permit before installing, modifying, or placing a grease interceptor into service. Operating without a valid permit is not a minor oversight: city inspectors actively cross-reference building permits, business licenses, and DWM connection records to identify non-compliant facilities. The permit requirement also ties directly into Chicago's water connection approval process — your water service application will not advance without documentation of a compliant grease management system.
Failing to obtain or maintain a valid Grease Trap/Interceptor Permit exposes your restaurant to a cascading set of consequences that go well beyond a one-time fine. The Chicago DWM and city inspectors can act quickly once a violation is identified, and the remediation process is both expensive and time-consuming. Specific consequences include:
- Sewer service disconnection — the DWM has authority to physically disconnect your water and sewer service until compliance is documented, which means an immediate forced closure
- Monetary fines — violations of Chicago's sewer use ordinance can result in per-day fines; contact the Chicago DWM to confirm current fine schedules, as amounts are subject to revision
- Mandatory remediation costs — you may be required to fund emergency sewer line cleaning or FOG removal at city-billed rates if discharge causes a blockage
- Permit revocation — your food service establishment permit and business license can be suspended or revoked by the city pending compliance
- Insurance and lease implications — most commercial kitchen leases require tenants to maintain all required permits in good standing; a lapsed or missing grease interceptor permit can constitute a lease default, and some insurers will deny claims for incidents tied to unpermitted infrastructure
Legal code: Local sewer use regulations, water connection requirements, road/sidewalk ordinances, grease discharge limits
Recent update: As of 2025, the Metropolitan Water Reclamation District of Greater Chicago updated its FOG (fats, oils, and grease) discharge control requirements, increasing inspection frequency for high-volume food service facilities — contact the Chicago DWM to confirm whether your establishment's interceptor sizing and maintenance schedule meets the revised standards.
Who Needs a Grease Trap/Interceptor Permit?
| Type | Required | Notes |
|---|---|---|
| Restaurant (Full-Service) | Required | Full-service restaurants discharge grease-laden wastewater from cooking equipment and are required under Chicago Municipal Code § 11-12-540 to install and permit a grease interceptor sized to their fixture units. |
| Bar / Nightclub | Required | Bars and nightclubs that operate any food preparation or kitchen equipment — including fryers, flat-tops, or commercial dishwashers — must obtain a grease interceptor permit per Chicago Department of Water Management (DWM) Pretreatment Program requirements; a bar serving only packaged snacks with no cooking equipment should confirm exemption status directly with DWM. |
| Food Truck | Required | Chicago food trucks must discharge wastewater only at an approved commissary or dump station equipped with a permitted grease interceptor; the food truck operator is responsible for ensuring that commissary facility holds a valid grease interceptor permit, and the truck itself may require a grease trap inspection as part of the Chicago Department of Public Health mobile food facility license. |
| Coffee Shop / Café | Required | Coffee shops using commercial espresso machines, dishwashers, or any food prep equipment that generates grease-laden waste are subject to Chicago Municipal Code § 11-12-540; a café limited strictly to drip coffee and no food preparation may qualify for a reduced-capacity or under-sink trap, but must still obtain DWM approval before connecting to the sewer. |
See which restaurant types need this requirement — and which don't.
See Full Requirements →Field-by-Field Guide (25 Fields)
21 of 25 auto-filledLegal Business Name
textEnter the full legal name of your business exactly as it appears on your Illinois business registration or Articles of Incorporation — not your DBA or trade name.
COMMON MISTAKE: Entering a trade name or shortened nickname (e.g., 'Joe's Diner' instead of 'Josephine's Restaurant Group LLC') causes an immediate mismatch with City of Chicago business license records and triggers rejection.
Business Type and Classification
textEnter your business entity classification (e.g., LLC, Corporation, Sole Proprietorship, Partnership) and your food service category (e.g., Full-Service Restaurant, Food Prep Facility, Bakery) as recognized by the Chicago Department of Business Affairs and Consumer Protection.
COMMON MISTAKE: Leaving this field vague (e.g., writing 'restaurant' without specifying entity type) can delay permit review because Chicago Department of Water Management reviewers use this field to determine applicable grease interceptor sizing standards.
Business License or Registration Number
textEnter the Chicago Business License number issued by the Department of Business Affairs and Consumer Protection (BACP) — this is a numeric identifier typically found on your issued license certificate or via the Chicago Business License Lookup portal.
COMMON MISTAKE: Entering an Illinois state registration number or federal EIN instead of the Chicago-specific BACP license number will cause a database mismatch and result in rejection; these are distinct identifiers.
Business Registration or License Documentation
textReference or attach the document name and issuance date of your current Chicago Business License or Illinois Secretary of State business registration — reviewers use this to verify active standing before issuing a grease trap permit.
COMMON MISTAKE: Referencing an expired business license document is one of the most common causes of rejection; confirm your Chicago Business License is active and not within 30 days of expiration before submitting.
Property Owner or Authorized Representative Name
textEnter the full legal name of the property owner of record — as listed on the Cook County Assessor's records — or the name of a person with documented authorization to consent to installation on the property.
COMMON MISTAKE: Entering the restaurant operator's name here when they are a tenant (not the property owner) without a corresponding authorization letter will cause rejection; if you are a tenant, attach a signed landlord authorization.
Owner Contact Information
textProvide the property owner's or authorized representative's current phone number and mailing address so Chicago Department of Water Management inspectors can schedule site verification and communicate permit status.
COMMON MISTAKE: Listing a contact phone number that goes to voicemail without a callback or an outdated mailing address slows inspector coordination and can result in administrative delays of 1–2 weeks.
Property Ownership Status
textIndicate whether the applicant owns the property outright, holds a lease, or operates under a sublease — this determines what supporting authorization documents are required for the permit application.
COMMON MISTAKE: Selecting 'Owner' when your business actually holds a lease agreement causes a verification failure when reviewers cross-reference Cook County property tax records; confirm your actual ownership status before entering.
Proof of Property Ownership or Lease Authorization
textReference or attach the document establishing your right to install a grease trap on the property — this is either a recorded deed (for owners) or a lease agreement with an explicit clause permitting plumbing modifications (for tenants).
COMMON MISTAKE: Submitting a lease agreement that does not contain a clause explicitly authorizing plumbing or mechanical alterations is a frequent cause of rejection; review your lease with your landlord and obtain a written authorization addendum if needed.
Property Address Where Grease Trap Will Be Installed
textEnter the full street address of the food service establishment where the grease interceptor will be installed, including Chicago ward number if known — this must match the address on your Chicago Business License exactly.
COMMON MISTAKE: Entering your corporate mailing address or a P.O. Box instead of the physical restaurant address will cause an immediate rejection, as the Chicago Department of Water Management requires the installation site address for inspection scheduling.
Grease Trap Location on Property (Interior/Exterior)
textSpecify whether the grease interceptor will be installed inside the building (typically under-sink or in a utility room) or outside the building (typically an in-ground exterior interceptor) — Chicago Municipal Code § 18-29-1003 governs placement requirements based on this designation.
COMMON MISTAKE: Marking 'Interior' when your plumbing plans actually show an exterior in-ground interceptor creates a conflict with submitted drawings and triggers a plan review hold; ensure this field matches your licensed plumber's submitted site plan exactly.
ApronPrep auto-fills 21 of 25 fields from a single compliance interview — no re-typing, no guessing what the government expects.
Top 5 Grease Trap/Interceptor Permit Mistakes
1. Submitting Incorrect or Outdated Grease Interceptor Sizing Calculations
Chicago's Department of Water Management requires interceptor sizing to comply with the Chicago Plumbing Code (Title 18-29 of the Municipal Code), and reviewers will reject applications where the submitted capacity calculations don't match the fixture unit count or peak flow rate documented elsewhere in the packet. For example, listing a 1,000-gallon interceptor for a full-service kitchen with 8 grease-producing fixtures will trigger an automatic deficiency notice if the code-required minimum for that fixture load is 1,500 gallons. Verify your sizing calculations against the current Illinois Plumbing Code fixture unit tables before submitting — a rejected sizing calculation typically adds 3–5 weeks to your timeline.
2. Missing or Incomplete Plumbing Permit Cross-Reference
A Grease Trap/Interceptor Permit in Chicago is not issued in isolation — it must be tied to an active plumbing permit issued by the Chicago Department of Buildings (DOB), and applications submitted without a valid associated plumbing permit number are rejected at intake. A common error is submitting the grease trap application before the plumbing permit has been approved, leaving the permit number field blank or entering a pending application number. Pull your active DOB plumbing permit number from the Chicago Buildings permit portal (ibuild.chicago.gov) before starting the grease trap application — submitting without it adds at minimum 2–3 weeks while the plumbing permit clears.
3. Incorrect Installation Address or Wrong Zoning District Entry
The installation address on the grease trap application must match exactly the address on file with the Chicago Department of Water Management and the associated plumbing permit — unit number formatting discrepancies (e.g., '2F' vs. 'Unit 2F') or use of a mailing address instead of the physical service address are flagged as mismatches and returned for correction. Reviewers also verify that the listed zoning district is consistent with the Chicago Zoning Map; entering a zoning classification from memory rather than confirming it in the Chicago Zoning Map portal (gis.chicago.gov) is a frequent source of errors. Always confirm both the exact address format and current zoning classification from official city systems before entering them — address mismatches alone account for a significant share of first-submission rejections and add 1–2 weeks to processing.
Skip the Paperwork on Your Grease Trap/Interceptor Permit
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Grease Trap/Interceptor Permit by City in Illinois
| City | Fee Range | Timeline |
|---|---|---|
| Aurora | ||
| Chicago | Contact Chicago Department of Water Management for current permit fee structure | Contact Chicago Department of Water Management for estimated processing timeline |
| Rockford |
Government Filing Fees
Contact Chicago Department of Water Management for current permit fee structure
Timeline: Varies
Contact Chicago Department of Water Management for grease trap/interceptor permit requirements
Call the Department of Water Management's Sewer Construction Division at (312) 744-9277 or visit their office at 111 E. Erie St. to confirm current permit requirements, approved interceptor sizes, and any recent changes to the 2024 Sewer Construction Regulations. Many restaurants skip this step and submit non-compliant applications — confirming requirements first avoids 3–4 week delays. Allow 1–2 hours for this call and any follow-up emails.
Complete the grease trap/interceptor permit application form
Fill out the Department of Water Management's grease trap/interceptor permit application (typically 8–12 fields) with your restaurant's legal name, address, facility type, and proposed interceptor capacity. Have your business license number, EIN, and plumbing contractor's license ready. Most applicants complete this form in 20–30 minutes with all documents organized.
Prepare site plans and drainage diagrams showing grease trap/interceptor location
Work with a licensed professional engineer or plumbing designer to create a site plan and drainage diagram (typically 1–2 pages) showing the grease trap/interceptor location, size, depth, distance from the building, connection points to the sewer line, and compliance with Chicago's 2024 Sewer Construction Regulations. The plan must show measurements in feet and indicate cleanout access points. This is the #1 document rejected for incomplete or unclear drainage details — invest time here to avoid resubmission.
Where to Apply
Applications are handled by your local department of public works (dpw) in each city. Select your city below for authority details, fees, and processing timeline.
Other Requirements You'll Need
This is one of 13 requirements for opening a restaurant in Illinois.
ADA Compliance Self-Certification
federal
Alarm System Permit/Registration
local
Alcohol Server Training Certification (BASSET)
state
Annual Report Filing
state
See all co-required forms and how they connect to your compliance dossier.
See All RequirementsProcessing timelines vary depending on whether your grease trap system requires modifications or passes inspection on the first attempt, per the Chicago Department of Public Health website. Initial permit applications typically receive a decision within 2–4 weeks of submission, but if the Department of Water Management inspection identifies code violations, you may need to complete repairs and resubmit for a second inspection, adding another 1–2 weeks. Expedited review is not available for this permit class.
Chicago does not charge a separate government filing fee for grease trap/interceptor permits — the requirement is enforced through the City Business License/Registration and food service inspections. However, you will incur costs for the grease trap system itself (installation or upgrade), mandatory inspection fees charged by the Department of Water Management (typically $150–$300 per inspection), and any repairs needed to meet code standards. Contact the Chicago Department of Public Health to confirm current inspection fee schedules. Not legal advice — verify all costs with the City of Chicago.
No — grease trap/interceptor permits are location-specific and tied to the physical address of your restaurant, per Chicago Municipal Code § 13-148. If you relocate your restaurant, you must apply for a new permit at the new address and have the grease trap system inspected by the Department of Water Management before you can begin operations. You will also need to update your City Business License/Registration with the new address.
Grease trap/interceptor permits do not expire and do not require formal renewal filings, as stated in the Chicago Department of Public Health guidelines. However, you must maintain compliance with Chicago Municipal Code § 13-148 at all times: keep the grease trap inspected and serviced per schedule, maintain documentation of pumping and maintenance records, and allow Department inspectors access to verify compliance. Failure to maintain the system can result in violations during routine food service inspections.
During a Department of Water Management inspection, an inspector will verify that your grease trap system meets size requirements for your restaurant's kitchen load, check that the system is properly installed and sealed per Chicago Municipal Code § 13-148, confirm that grease discharge is directed to the trap (not to sanitary sewer), and review your maintenance and pumping records. If the system fails inspection, you will receive a written violation notice specifying required repairs; you must schedule a follow-up inspection once corrections are completed. Documentation of all inspections and repairs should be retained for at least 3 years.
About This Data
This guide is generated from ApronPrep's compliance dossier system, which uses 53 parallel AI authority experts to discover requirements, then downloads actual forms and generates field-level intelligence for each one.
For Illinois specifically, we have analyzed compliance dossiers for 3 cities (Aurora, Chicago, Rockford), generating Rich FILs (Form Intelligence Layers) with 25 form fields analyzed for this requirement. Fee data is sourced from actual county department fee schedules, not estimates.
Our data is verified against official government sources and updated when regulatory changes are detected. If you find an error, please report it — accuracy is our core commitment.
Sources
- Local sewer use regulations, water connection requirements, road/sidewalk ordinances, grease discharge limits
- Aurora — Department of Public Works (DPW)
- Chicago — Department of Public Works (DPW)
- Rockford — Department of Public Works (DPW)
This Form Is One of 60+ Requirements.
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