Grease Trap Requirements
Madison, WI
FOG compliance regulations for food service establishments in Madison, Wisconsin.
Regular pumping required
Pumping Freq.
Required
Permit
Yes
25% Rule
UPC
Code Base
Pumping Requirements
Frequency Regular pumping required; annual proof of maintenance must be submitted
25% Rule Applies
Permits & Enforcement
Permit Required Required
Permit Fee Contact Building Inspection Plumbing Dept at 608-266-4346
Max Fine Per Madison Code of Ordinances enforcement provisions
Complete FOG Regulations
| Minimum Trap Size | Per Wisconsin Plumbing Code requirements |
|---|---|
| Pumping Frequency | Regular pumping required; annual proof of maintenance must be submitted |
| 25% Rule | Yes — trap must be pumped when grease and solids reach 25% of capacity |
| Permit Required | Yes |
| Permit Fee | Contact Building Inspection Plumbing Dept at 608-266-4346 |
| Maximum Fine | Per Madison Code of Ordinances enforcement provisions |
| Inspections | Annual proof of maintenance required; periodic city inspections |
| Record Keeping | Required — maintain pumping logs and manifests on-site |
| Plumbing Code | Uniform Plumbing Code (UPC) |
| Ordinance Ref. | Madison Code of Ordinances Chapter 18 – Plumbing Code; MMSD Sewer Use Ordinance |
| Authority | City of Madison Engineering Dept; Madison Metropolitan Sewerage District (MMSD) |
Additional Notes
External grease interceptors must be pumped, not skimmed. Annual proof of maintenance must be submitted to the city. Contact Building Inspection Plumbing Department for interceptor requirement questions.
Regulations change frequently. Always verify current requirements with your local wastewater authority or plumbing inspector before making compliance decisions. Last updated: March 2026.
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