Indiana Grease Trap Regulations
FOG Compliance Overview
Indiana follows the International Plumbing Code (IPC) as its base plumbing code. The IPC requires grease interceptors for food service establishments and references sizing based on fixture unit counts and flow rates. The state's regulatory authority is the Indiana Department of Environmental Management (IDEM).
With approximately 13,400 food service establishments statewide, Indiana has significant FOG compliance needs. Individual cities and municipalities may adopt additional local ordinances that go beyond the state plumbing code, including stricter pumping schedules, permit requirements, and enforcement penalties. Of the 6 cities we cover, 4 require a dedicated FOG permit. 3 cities enforce the 25% rule for grease trap pumping.
Need a grease trap in Indiana?
Our free calculator uses IPC code requirements to recommend the right size for your establishment.
Size My Grease TrapCity Regulations in Indiana
| City | Pumping Frequency | Permit | 25% Rule |
|---|---|---|---|
| Bloomington | See details | Required | — |
| Carmel | Monthly | Required | — |
| Evansville | Every 6 month(s); or when grease/solids reach 25% of ca... | — | Yes |
| Fishers | Weekly | — | — |
| Fort Wayne | Regular pumping required; frequency based on establishm... | Required | Yes |
| Indianapolis | At minimum every 90 days; facilities may request altern... | Required | Yes |
Frequently Asked Questions
What plumbing code does Indiana follow for grease traps?
Indiana follows the International Plumbing Code (IPC). The IPC requires grease interceptors for food service establishments and sizes them based on fixture unit counts and flow rates. Individual cities may adopt stricter local ordinances.
How many food service establishments are in Indiana?
Indiana has approximately 13,400 food service establishments according to Census Bureau County Business Patterns data. We currently cover detailed FOG regulations for 6 cities in the state.
Do I need a grease trap permit in Indiana?
Permit requirements vary by city. Of the 6 cities we cover in Indiana, 4 require a dedicated FOG permit. Check your specific city's requirements below or contact your local wastewater authority.
What size grease trap do I need in Indiana?
Grease trap sizing in Indiana depends on your establishment's flow rate, number of fixtures, and local code requirements under the IPC. Use our free sizing calculator for a recommendation tailored to your setup.
Regulations change frequently. Always verify current requirements with your local wastewater authority or plumbing inspector before making compliance decisions. Last updated: March 2026.