Published October 7, 2026 · Grand Natural Inc.
Most restaurant owners never watch their grease trap being cleaned. It often happens before opening or after close, and the crew is gone by the time the kitchen is busy. But knowing what a proper service includes is the best way to judge whether the company you pay is doing the job, or cutting corners that will lead to backups and fines later.
Before the visit
A good provider schedules service around your operating hours, usually early morning or after close, so pumping does not disrupt food prep. They should know where your trap or interceptor is, its size, and whether it is indoors under a sink or buried outside. For outdoor interceptors, they will need clear access to the lids and somewhere to park a pump truck.
Step 1: Measure before pumping
Before anything is removed, the technician opens the trap and measures the grease layer on top and the solids layer on the bottom, often with a sampling tool sometimes called a sludge judge. This tells you how full the trap was. If grease and solids together take up more than about a quarter of the trap's depth, a widely used industry threshold, the trap was due for service sooner. These measurements are what let you set the right schedule over time.
Step 2: Pump everything out
A proper service removes the entire contents of the trap: floating grease, the water layer and settled solids. Some providers only skim grease off the top. Skimming leaves the solids that cause clogs and odors, and it is not the same service even if it is billed as cleaning. Our guide to pumping vs. cleaning explains the difference.
Step 3: Clean the walls and baffles
Grease sticks to the walls, lid and baffles. The technician scrapes these surfaces so buildup does not restrict flow or break off later. Inlet and outlet pipes are checked for blockages.
Step 4: Inspect the components
With the trap empty, the technician can inspect the parts that wear out:
- Baffles and dividers that slow flow so grease can separate
- Inlet and outlet fittings and tees
- Lid gaskets and seals, which control odor
- Signs of corrosion or cracks in the tank
A damaged baffle can let grease pass straight through to the sewer, which defeats the purpose of the trap. Any problems should be reported to you with photos.
Step 5: Close up and record
The lids are resealed and the area is cleaned. You should receive a service record or manifest showing the date, the volume removed, the grease and solids levels found, and where the waste is being taken. Many local grease-control programs require you to keep these records and produce them on request.
Step 6: Proper disposal
The waste is hauled to a facility permitted to accept grease trap waste. It should never be mixed into a used cooking oil container or dumped. A licensed hauler can tell you where it goes.
Red flags
- No measurement of grease and solids levels
- Skimming the top instead of a full pump-out
- No written record or manifest after service
- Enzymes or additives sold as a replacement for pumping
- Unclear answers about licensing or where the waste goes
How Grand Natural handles it
Our grease trap cleaning service includes full pump-outs, level measurements and digital service records for every visit, on a schedule set by your kitchen's actual volume. If you are not sure how often your trap needs service, start with our guide on how often to clean a commercial grease trap.
Need service for your kitchen? Grand Natural provides used cooking oil collection, grease trap cleaning, hood cleaning, and kitchen line jetting to restaurants nationwide. Call (855) 519-5550 or request service online.