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Grease Trap vs Grease Interceptor: What's the Difference?

How to tell which one your kitchen has, and why it changes the cleaning schedule, who can do the work and what it costs.

Updated

Grease Trap Cleaning Tampa uses the City of Tampa's definitions. A grease trap is a small unit inside the building, rated at 50 gallons per minute or less, cleaned at least weekly. A grease interceptor is an outdoor, in-ground tank rated above 50 gpm or holding 750 gallons or more, pumped by a registered hauler on a longer schedule.

Side by side

Grease trap Grease interceptor
Where Inside: under a sink or in the floor Outside: in-ground, under manhole covers
Size (Tampa definition) Rated at 50 gpm or less Rated above 50 gpm or 750+ gallons
Typical capacity Up to about 100 gallons 750–2,500+ gallons
Cleaning frequency At least weekly in most programs 30 days to condition-based, by jurisdiction
Who may clean it Staff (within limits) or a hauler Registered hauler only
Typical cost per service $150–$350 (low confidence) $300–$1,200 by size (medium)
Installed cost (City of Tampa) $250–$1,500 for 0–100 gal $4,000–$8,500 for 750–1,500 gal

How they work

Both do the same job. They slow wastewater down so grease floats and solids sink, and the clearer water in between leaves through the outlet. Hillsborough County describes traps as generally ranging from 5 to 50 gallons per minute, and interceptors as concrete tanks, accessible through two manhole covers, that catch grease before it reaches the sewer main.

Why the difference matters

  • Schedule. Indoor traps fill in days and are cleaned weekly in the City of Tampa, Temple Terrace, Pinellas County and St. Petersburg. Interceptors run on 30-day, 90-day or condition-based rules.
  • Who does the work. In Tampa, staff may clean a trap under a written protocol. Interceptors must be pumped by a City-registered hauler. Hillsborough County allows self-cleaning only for traps under 50 pounds of grease capacity.
  • Cost. A trap is cheap per visit but frequent. An interceptor costs more per visit but is pumped less often.

Which one does the code require?

Sizing and type are set by the Florida Building Code – Plumbing, based on your fixtures and flow. The City of Tampa publishes a sizing calculator, and Hillsborough County directs owners to a licensed commercial plumber. See grease trap installation. For service, see indoor grease trap cleaning or grease interceptor pumping.

Bottom line

Inside under a sink or in the floor: a trap, cleaned weekly. Outside under manhole covers: an interceptor, pumped by a registered hauler. Each has its own rules and costs. Not sure which you have? Call (727) 476-9241.

Questions about this

How do I know if I have a grease trap or an interceptor?

Look for where it is. A trap sits inside, under a sink or set in the kitchen floor, with a removable lid. An interceptor is outside, usually in-ground under one or two manhole covers in a parking area or behind the building.

Which is better, a grease trap or an interceptor?

Neither. The plumbing code decides which you need based on your fixtures and flow. A trap is cheaper to install but needs weekly cleaning. An interceptor costs more up front and is pumped less often.

Can a kitchen have both?

Yes. Some kitchens have indoor traps at certain fixtures and an outdoor interceptor taking the combined flow. Each unit follows its own cleaning rule.
Call (727) 476-9241 · Talk to a person about your trap