A grease interceptor is a large tank, usually buried outside the building, that handles the combined flow from an entire kitchen or several food businesses. Because it is out of sight, buildup can go unnoticed until a line backs up or an inspector lifts the lid. Cleaning removes the material a pump-out leaves behind and gives you a clear look at the condition of the tank. Call to reach a provider who services in-ground interceptors.
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How interceptors differ from indoor traps
Indoor grease traps are compact units under a sink or set in the kitchen floor, sized by flow rate. Grease interceptors are sized by capacity, commonly from about 500 to several thousand gallons, and are usually installed below grade outside the building.
That size changes the work. Interceptors have multiple compartments, inlet and outlet tees, heavy access lids and sometimes sample ports. They are serviced from a vacuum truck rather than by hand, and the cleaning that follows involves equipment and safety procedures a small trap never needs.
What thorough cleaning includes
- A full pump-out of every compartment, not just the first
- High-pressure jetting of walls and baffles to remove hardened grease
- Removal of compacted solids from the tank floor
- Clearing of inlet and outlet tees and the crossover between compartments
- A check of lids, risers and seals for cracks or gaps
- A written report describing condition and any repairs needed
Ask whether jetting is included or priced separately, and whether every compartment will be emptied.
Confined space considerations
An interceptor is a confined space. Gases from decomposing grease and food waste, including hydrogen sulfide, can build up inside, and oxygen levels can be low. Entering the tank without proper equipment and procedures is dangerous.
Most cleaning is done from above with hoses and jetting wands. When entry is necessary, providers are expected to follow confined space practices such as atmospheric testing, ventilation and a standby attendant. Kitchen staff should never enter or lean into an open interceptor.
Inspecting tees, baffles and lids
The internal parts do most of the work. Inlet tees slow incoming water and direct it downward. Baffles separate compartments so grease has time to rise. Outlet tees draw water from the middle layer so floating grease stays behind.
Over time these parts corrode, crack or break off, especially in older concrete tanks. A missing outlet tee can let grease flow straight into the sewer even when the tank is pumped on schedule, so a good visit includes a look at each part and a note on its condition.
Lids and risers matter too. Cracked lids let surface water in, and loose lids are a hazard in parking lots and drive-throughs.
How buildup affects inspections
Inspectors typically look at the depth of grease and solids, the condition of internal parts and your service records. Heavy buildup, a damaged outlet tee or a gap in documentation can lead to a notice of violation, required corrective action or more frequent inspections.
Scheduling a thorough cleaning ahead of a known inspection, and keeping the report from that visit, puts you in a stronger position. If you have already received a notice, tell the provider when you call so they can focus on the items cited.
Planning ranges for interceptor cleaning
Costs vary widely with tank size, number of compartments, access, jetting and disposal fees. As a general planning range, cleaning a 1,000 gallon interceptor might fall between $325 and $1,050. This is not a quote. Pricing is set by the provider before any work starts.
Grease interceptor cleaning questions
Is interceptor cleaning different from interceptor pumping?
Pumping removes the contents. Cleaning adds jetting of walls and baffles, removal of compacted solids and an inspection of internal parts. Many providers offer both in one visit.
How do I find my interceptor?
Look for one or more heavy round or square lids in the ground near the kitchen, often in a parking area or behind the building. Building plans or an old service record can also show the location.
What if parts inside are broken?
The provider should note damaged tees, baffles or lids in their report. Repairs may be priced separately, and pricing is set by the provider before any work starts.
Can cleaning happen while the kitchen is open?
Often, because interceptors are outside. Water use may need to be limited while the tank is open. Ask the provider how they handle access during service hours.