States / Illinois / Oak Brook

Oak Brook, IL grease trap & interceptor requirements

Program run by Flagg Creek Water Reclamation District / Downers Grove Sanitary District; Village of Oak Brook; DuPage County Health Department. Hand-checked against source Last checked 2026-10-17. Report an error / rule changed

Quick answer

From the official source(s) below, last checked 2026-10-17. Rules change; verify with your city.

Need a pump-out? See 4 pumping companies serving Oak Brook ↓

Rules change; verify with your city. Summaries are plain-English restatements of the official source linked below; “Source says” shows the exact wording. Blank rows mean the sources we checked did not state that rule, not that there is no rule.

Required trap / interceptor type
Oak Brook sanitary sewers are maintained by either the Flagg Creek Water Reclamation District or the Downers Grove Sanitary District, so the grease rules of whichever district serves the property apply. Illinois Plumbing Code (77 Ill. Adm. Code 890.510): commercial kitchens must have a grease interceptor with all grease-carrying fixtures directed to it; food waste disposers may not discharge into it, and water-cooled interceptors are prohibited.
✓ checked against source
Sizing rule
Illinois Plumbing Code minimum: the interceptor must hold at least half the liquid capacity of the connected fixtures on the same floor (60% if it sits on a floor below); fixture capacity in gallons = length × width × depth in inches ÷ 231.
✓ checked against source
Pumping / cleaning frequencyNot stated in the sources we checked
Permit required?
Flagg Creek requires a permit before installing a new grease interceptor/trap, with inspection by a District inspector; new commercial construction or significant remodels must submit sewer plans for District plan review. Flagg Creek also issues F.O.G. permits, billed annually (Ordinance No. 821).
Food-handling construction must be approved by the DuPage County Health Department before the Village issues a building permit.
✓ checked against source
Permit & program feesNot stated in the sources we checked
InspectionsNot stated in the sources we checked
Record keepingNot stated in the sources we checked
Pumper / hauler approval
Flagg Creek requires a permit for grease haulers operating within the District; haulers discharging grease waste at the DGSD treatment plant need a DGSD Waste Transporter Permit.
✓ checked against source
Reporting portalNot stated in the sources we checked
Fines & penaltiesNot stated in the sources we checked
Program contact
Flagg Creek WRD: 630-323-3299; Downers Grove Sanitary District: (630) 969-0664; DuPage County Health Department (food): (630) 620-3350.
✓ checked against source

Sources

Grease trap pumping companies in Oak Brook, IL

4 companies that say on their own website they serve Oak Brook. Free listings are sorted A–Z. A listing is not an endorsement.

Before you book: Oak Brook has hauler rules (see the table above). Ask the company to confirm it is approved for Oak Brook, and keep a signed manifest for every pump-out.

All Illinois pumpersNational directoryRun a pumping company? List it free

Size your interceptor

Use the grease interceptor sizing calculator (UPC, IPC and PDI methods), then confirm Oak Brook's own minimums above. Not sure how often to pump? Read how often to pump a grease trap.

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