Grease Trap Requirements
Wilmington, DE
FOG compliance regulations for food service establishments in Wilmington, Delaware.
Pumping Requirements
Permits & Enforcement
Complete FOG Regulations
| Minimum Trap Size | Per IPC 2018 sizing: peak drain flow (GPM) x 30-minute retention time |
|---|---|
| Pumping Frequency | Contact local authority for requirements |
| 25% Rule | Yes — trap must be pumped when grease and solids reach 25% of capacity |
| Permit Required | Yes |
| Inspections | Plumbing inspector inspections per city building code |
| Record Keeping | Required — maintain pumping logs and manifests on-site |
| Plumbing Code | International Plumbing Code (IPC) |
| Ordinance Ref. | Wilmington City Code Chapter 4 (Building and Building Regulations); Delaware Plumbing Code 2021 (based on IPC 2018), Chapter 10 |
| Authority | City of Wilmington Department of Licenses and Inspections / Delaware DNREC |
Additional Notes
Delaware adopted the IPC 2018 as its plumbing code base. Grease interceptors or automatic grease removal devices required for all food preparation areas (restaurants, hotel kitchens, hospitals, school kitchens, bars, factory cafeterias, clubs). Size, type and location must conform to manufacturer's instructions and code requirements. Plumbing work requires a city permit.
Regulations change frequently. Always verify current requirements with your local wastewater authority or plumbing inspector before making compliance decisions. Last updated: March 2026.
Contact Information
Delaware Plumbing Permit & Inspection Program: (302) 744-1000, 302-515-3282 or dhss_dph_hsp@delaware.gov
Official Sources
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