Restaurants, cafeterias, food prep facilities, and any commercial operation that produces fats, oils, and grease (FOG) need a grease trap. Marion County has specific compliance requirements, and operators who don't follow them face fines, health inspector flags, and the operational risk of FOG line backups during peak service. Here's the operator's reference.
Grease Trap Maintenance Schedule: Marion County FOG ordinance basics
The relevant rule: grease traps must be cleaned when the combined FOG (floating grease + settled solids) reaches 25% of total trap volume. Practically, this means most traps need service every 30-90 days depending on volume. Health inspectors can check at any visit, and they often do.
Documentation required: service date, volume pumped, hauler license number, disposal facility name. We provide all four with every service. Some operators are also required to file manifest reports with the city — we handle those when applicable.
Service interval by trap size and volume
| Trap Size | Operation Volume | Recommended Interval |
|---|---|---|
| 20-50 gallon under-sink | Coffee shop, light food prep | Every 30-45 days |
| 20-50 gallon under-sink | Full-service restaurant | Every 30 days (monthly) |
| 100-250 gallon | Mid-size restaurant | Every 60 days |
| 500-1,000 gallon outdoor | Full-service restaurant | Every 60-90 days |
| 1,000-2,000 gallon outdoor | Multi-tenant or large operation | Every 90 days |
| 2,000+ gallon | Commercial cafeteria, food service complex | Per ordinance, often quarterly |
These are guidelines. The 25% rule is what counts — service when the trap reaches that threshold, not on a calendar alone.
Why pumping alone isn't enough — the FOG line problem
Pumping the trap removes the floating grease and settled solids inside the trap itself. But the discharge line from the trap to the city sewer accumulates emulsified grease that pumping doesn't reach. Over months, this line narrows, eventually causing backups despite a perfectly clean trap.
Solution: quarterly hydro jetting of the FOG line. 4,000 PSI water scours the line walls clean of emulsified grease. Restaurants that add quarterly jetting to their service program rarely see backups; restaurants that pump-only do see them, typically during peak service when downtime is most costly.
Off-hours service scheduling
Active restaurants don't want drain trucks during dinner service. We schedule grease trap and FOG line work for off-hours:
- 5-8 AM — most common, before kitchen prep starts
- After 10 PM — for restaurants with late service
- Sunday/Monday mornings — if the restaurant is closed those days
Same flat-rate at any of these times. No overtime, no off-hours fee.
Documentation we provide every service
- Service log entry — date, time, trap size, FOG measurement at arrival, volume pumped
- Hauler license number — proves the waste was handled by licensed personnel
- Disposal facility name and address — where the FOG was taken
- Photo documentation — pre and post service (optional but available)
- Manifest filing — if your facility requires city manifest reporting, we handle it
All documents delivered same-day digitally + printed copy left at the restaurant. Health inspectors get the binder.
The cost of non-compliance
- Marion County fines: $250-$2,500 per violation
- Health inspector flags: can affect permitting
- FOG line backup: $2,000-$10,000+ in cleanup, business interruption, possible permit suspension
- Reputation cost: incalculable
Compliance service contracts run $1,200-$8,000/year depending on trap size and operation. Cheaper than non-compliance, by a wide margin.
Choosing a grease trap service provider
The cheapest provider is rarely the best choice. Look for:
- Indiana-licensed liquid waste hauler
- Documented disposal facility relationships
- FOG line jetting capability (most pump-only providers don't have jetters)
- Off-hours dispatch standard practice
- Compliance documentation provided automatically
- Service contract flexibility (no long-term lock-in)
See our grease trap cleaning service page for our standing contract pricing and scheduling.