Grease Trap Maintenance Checklist
A grease trap maintenance checklist template for a commercial kitchen interceptor, built around the measurement that sets the interval: pump when grease and solids together reach a quarter of the liquid depth, measured rather than guessed.
- Twenty-four confirmations across the service and what reaches the trap
- Seven readings before anything is removed, set against the quarter rule
- A waste transfer table, because where the grease went is a regulated question
- A Service Log that sets the interval from accumulation rather than the contract
Grease Trap Maintenance Checklist
One interceptor, one service, one record
| # | Service carried out | Done | Issue | Detail |
|---|---|---|---|---|
| 1 | Contents fully pumped out, not skimmed or partially removed | |||
| 2 | Baffles and tees inspected, present and correctly positioned | |||
| 3 | Unit refilled with clean water to operating level |
The document you will get. Download for the full, editable file.
Who this grease trap maintenance checklist is for
Four people touch this record, and the one who decides whether it works is not the one who signs it.
The kitchen manager or head chef
Most of what determines whether the trap copes happens at the sinks rather than at the trap. Section 5 is your half of the document: dry wipe before washing, strainers actually in use, used oil collected separately, and nothing dosed into the drain to make the problem look smaller.
Facilities or estates for a site with catering
You own the interceptor and the consent, and you are the one an inspector writes to. What you want from this is the measured accumulation rate, because it tells you whether the contract frequency you are paying for is the frequency the kitchen needs.
The grease service contractor
Your service is judged on the depths before and after, the volume removed and the transfer note number. The form is deliberately specific about full removal rather than skimming, because that is the difference a site cannot see once the lid is back on.
Whoever answers to the sewer authority
Discharge consents, sampling and enforcement all come back to records rather than intentions. The documentation figure at the bottom of section 8 is the one that answers the only question that matters: how many of the services in the last twelve months have a transfer note behind them.
Which section matters the most in your sector
The interceptor is the same device everywhere. What changes is how hard it is worked, how many kitchens discharge into it, and who gets the enforcement notice when it stops separating.
- FM service providers
The waste transfer table. Where servicing is subcontracted, the client is relying on you to hold the evidence, and a missing transfer note is the gap that turns a routine inspection into a formal one.
FM service provider software - Retail and malls
Kitchen practice. Food courts put many tenants onto shared drainage, so the trap is only as good as the worst operator discharging into it, and section 5 is what you walk with each one.
Retail maintenance software - Healthcare
The service schedule. Hospital kitchens run continuously and cannot stop for an overflow, so the interval has to be set from measured accumulation rather than from the frequency the contract defaulted to.
Healthcare maintenance software - Education
The depth measurements. Campus catering is intensely seasonal, and a trap sized for term time fills at a completely different rate across a long vacation, which a fixed calendar interval gets wrong in both directions.
Campus maintenance software - Corporate facilities
The fixtures list. Staff canteens are often fitted out long after the building, and the commonest finding on this form is a dishwasher or a combi oven that was plumbed straight to the drain.
Corporate facilities software - Commercial real estate
The consent and the findings table. With food and beverage tenants on a shared system, the landlord holds the discharge consent while the tenants generate the grease, and the findings table is how that gets put in writing.
Portfolio maintenance software
What a grease trap maintenance record should contain
A grease trap maintenance checklist is the record of servicing a commercial kitchen interceptor and of what reaches it. It covers the depth measurements that decide when to pump, the service carried out, the waste transfer note, the kitchen practice feeding the trap, and the accumulation rate that sets the interval.
A. Fields specific to grease trap maintenance
| Field | What goes in it | Why it earns its place |
|---|---|---|
| Fixtures connected to the interceptor | Pot wash, dishwasher, prep sinks, combi ovens, floor gullies | Record what actually discharges through the trap rather than what should. A dishwasher plumbed around the interceptor is common, usually because of temperature concerns, and it sends the hottest and most emulsified grease straight to the sewer. |
| Interceptor type and capacity | Passive gravity, automatic grease removal, hydromechanical or gravity interceptor | The type sets what the service even consists of. An automatic unit has a skimmer, a heater and a timer to test and a collection container to empty, none of which exist on a passive trap under a sink. |
| Covers served per day and peak times | The load the trap is actually working against | Capacity means nothing without throughput. The same interceptor behind a sixty cover bistro and a four hundred cover canteen needs two completely different intervals, and this is the field that explains why. |
| Total liquid depth | The figure every other measurement is a share of | Measured first, because the quarter rule is a proportion rather than a thickness. Without it, a grease layer reading means nothing: eighty millimeters is comfortable in a deep interceptor and well past the trigger in a shallow one. |
| Floating grease and settled solids | Both layers, measured separately, then combined | People measure the grease and forget the solids underneath. The solids are what has already reduced the working volume, and a service that skims the top leaves them exactly where they are. |
| Combined as a share of liquid depth | The number the pump-out decision is made on | Twenty-five percent is the working trigger. Written as a share rather than a depth, it travels between interceptors of different sizes and stops the decision being an argument about what looks full. |
| Waste transfer record | Date, volume, carrier, license number, destination, note number | The table an inspector asks for first. Grease is a regulated waste, so the question is not whether it was removed but where it went, and the only acceptable answer is a numbered transfer note from a licensed carrier. |
| Kitchen practice | Twelve lines covering what reaches the trap at all | The half of the document the kitchen owns. Dry wiping, strainers in use, separate oil collection and no drain dosing between them do more for an interceptor than any change of service frequency. |
| Drain dosing | Enzyme, bacteria or emulsifier products used in the drains | Worth a line of its own because it looks like an improvement. Emulsifiers break grease into droplets that pass straight through the interceptor and re-form further down the sewer, which is why dosing is specifically prohibited in many areas. |
| Service schedule | Eight tasks with their frequency, last date, next date and status | Depth measurement, pump out, internal clean, baffle inspection, line jetting, automatic unit service, effluent sampling and consent review all run on different clocks. Marked Compliant, Due or Overdue, spelled exactly that way. |
| Accumulation per day | Volume removed divided by days since the previous service | The one calculated figure that changes behavior. Compare it with the contracted frequency: a trap filling faster than the contract assumes is heading for an overflow, and one filling slower is a standing cost nobody has questioned. |
| Documentation complete | Services in the last twelve months with a transfer note held | A percentage rather than a yes or no, because partial record keeping is the normal state and nobody notices until it is asked for. This is the figure to look at before an inspection rather than during one. |
If you cut this down, keep the depth measurements and the transfer table. Everything else on the form describes a service that was carried out. Those two decide whether the service happens at the right moment and whether you can prove where the waste went, and they are the two an enforcement officer will ask about in that order. A record that is thorough on the tasks performed and vague on the depths is a record of a contractor attending, which is a different thing from a record of an interceptor working. The accumulation figure is what turns the two of them into an interval you can defend rather than one you inherited.
B. What it looks like filled in
Four services on one interceptor over a year, on a quarterly contract, with the depths measured at each visit.
| Date | Combined depth | Share | Removed | Per day |
|---|---|---|---|---|
| 14 Feb | 45 mm | 11% | 280 L | 3.1 L |
| 16 May | 82 mm | 20% | 395 L | 4.3 L |
| 18 Aug | 126 mm | 31% | 620 L | 6.6 L |
| 20 Nov | 71 mm | 17% | 340 L | 3.6 L |
The contract frequency was wrong in both directions, and the measurements are what showed it. Quarterly servicing held the trap under the trigger through the quiet months and well past it through the busy ones. The February service came in at eleven percent, which is a tanker visit and a full fee for a trap that was still working. The August one was found at thirty-one percent, meaning it had been past the trigger and passing grease into the sewer for some weeks before anybody arrived. The accumulation column is the useful part: it runs from three liters a day in the quiet months to nearly seven in the busy ones, and no single interval fits that.
Word to adapt the service list and the kitchen lines to your own operation, Excel for the depth measurements, the waste transfer table and the Service Log tab that works out the accumulation rate for you, PDF for the copy the contractor signs at the trap. Free, and yours to rebrand.
How do you service a grease trap?
One interceptor, one service, one record. The order matters, because the measurements taken at the start are what decide whether the service was needed and what the next interval should be. Six steps.
Record what actually discharges into the trap
Site, premises type, covers per day and peak service times, the interceptor reference, type and capacity, and the fixtures connected to it. Walk the connections rather than copying the last form, because a dishwasher or a combi oven plumbed around the interceptor is the single most common finding and it defeats everything else on this list.
Measure the depths before anything is removed
Total liquid depth first, then the floating grease layer, then the settled solids, then the two combined and that figure as a share of the liquid depth. Add the freeboard to the outlet and the appearance of the effluent. Seven readings, each with how it was measured and who took it.
Empty it fully, then clean and inspect it
The contents pumped out rather than skimmed, the interior walls and baffles scraped, the baffles and tees checked for presence and position, the inlet and outlet rodded clear, the lid and gasket reseated, and the unit refilled with clean water to its operating level. On an automatic unit, test the skimmer, the heater and the timer and empty the collection container.
Record where the waste went
Date, volume removed, carrier, license number, destination and the transfer note number, with a column confirming the note is actually held. This is the table an inspector asks for first, and the one most sites discover is incomplete at the worst possible moment.
Walk the kitchen practice with the people who run it
Twelve lines covering dry wiping before washing, strainers fitted and in use, used oil collected separately, no enzyme or emulsifier dosing into the drain, wash temperatures, staff briefing, signage and where the dishwasher and floor gullies discharge. Any one of these can undo a perfect service inside two weeks.
Set the next interval from the measurement, not the contract
Divide the volume removed by the days since the previous service to get accumulation per day, and compare it with the contracted frequency. Over three services that figure tells you the interval that keeps the trap under a quarter, which is usually not the interval you are paying for.
A full pump out versus a skim
Two visits can produce an identical signed sheet and leave the interceptor in completely different conditions. The difference is not the paperwork, it is whether the solids came out.
| Aspect | A skim or partial service | A full pump out |
|---|---|---|
| What is removed | The floating grease layer, and the smell with it | The entire contents, grease and settled solids together |
| Working volume afterwards | Still reduced by the solids nobody touched | Restored to what the interceptor was sized for |
| Time on site | Quick, and quick is what a fixed price rewards | Longer, because the walls and baffles get scraped |
| How it looks on the lid | Clean surface, no odor, apparently serviced | Identical, which is the entire problem |
| Next depth reading | Starts well above zero and reaches the trigger early | Starts near the bottom, so the interval means something |
| What the record says | Serviced, with no depths to contradict it | Serviced, with a before and after that can be checked |
The measurement is what makes the distinction visible, which is why it goes on the form rather than in the contract. A skim is not fraud and it is rarely deliberate: it is what a fixed price visit tends towards when nobody is recording depths, because the surface is the part that smells and the part a site looks at. The solids underneath are what has already taken the working volume away, and they are invisible once the lid is back on. Recording the combined depth before the service and again after it costs a minute and settles the question permanently, because a trap that still reads well above zero on the way out was not emptied. Over three services those readings also produce the accumulation rate, which is the only sound basis for setting the interval, and the figure that tends to show the contracted frequency was never derived from this kitchen at all.
When the template starts to feel limiting
A sheet per service works. A site with four kitchens, a shared consent and a year of visits is where it stops, and it stops in the same four places every time.
The next service date lives on the last sheet
The only record of when the trap is next due is the form from the previous visit, filed wherever that site files things. Nobody outside the kitchen can see which interceptor is closest to its trigger, or which one quietly went past it.
Transfer notes are filed separately from the service
The service sheet is in one place and the carrier’s note is in another, usually attached to an invoice. The documentation percentage is only calculable by someone willing to cross reference a year of both, which is exactly why it gets calculated after a request rather than before.
Accumulation is per sheet, never per trap
Each form gives you one accumulation figure. The trend across a year, which is what actually sets the interval and reveals a seasonal kitchen, requires transcribing every sheet into something that can add them up.
Each kitchen reinvents what is on the list
Four kitchens on one site means four slightly different forms, four readings of what counts as serviced, and no way to compare a trap in one building against the same model in another.
What running this in Facilio looks like
The template is the paper version of this record. The measurements and the service lines are the same ones; the difference is that the interceptor becomes an asset with a history, the interval follows the accumulation rather than the contract, and the transfer note is attached to the service rather than to an invoice in another system.
Asset Intelligence
The interceptor has a history rather than a last sheet
Every depth reading, volume removed and finding attaches to the trap itself, so the question of whether this one fills faster than the identical unit in the next building becomes something you can look at rather than something you suspect.
Ops Performance Intelligence
The interval follows the measurement
Accumulation per day is calculated across services rather than within one, so the schedule moves with the kitchen. A trap whose rate climbs through a busy season raises the next service earlier instead of waiting for the date on the contract.
Contractor Work Tracker
The transfer note arrives attached to the service
The carrier, the volume and the note number are captured against the visit that produced them, which turns documentation from a cross referencing exercise into a field that is either filled or visibly empty.
Audit Report Intelligence
The documentation question answers itself
How many services in the last twelve months, how many have a transfer note, which sites are short and which traps went past the trigger before anybody attended. That is a report rather than an afternoon with a filing cabinet.
Hallucination-free by design. Atom AI answers from the records in your tenant rather than generating plausible text, so an empty field reads as empty rather than filled in for you.
Frequently asked questions
How often should a grease trap be serviced?
As often as the measurements require, which is what the quarter rule is for: pump when grease and solids together reach a quarter of the liquid depth. For a busy commercial kitchen that is commonly monthly, but the honest answer is that frequency is an output of the measurement rather than an input.
Set it over three services. Divide the volume removed by the days since the previous visit at each one, and the accumulation rate tells you the interval that keeps the trap under the trigger. It is routinely different from the frequency the contract defaulted to, in both directions.
What is the quarter rule?
It is the working trigger for pumping out: when the floating grease layer and the settled solids together reach twenty-five percent of the liquid depth, the interceptor is serviced. It is expressed as a share rather than a thickness so it travels between units of different sizes.
The reason it matters is that both halves get measured. Measuring only the grease and ignoring the solids underneath understates the position badly, because the solids are the part that has already taken the working volume away.
Does a grease trap stop working when it is full?
It stops trapping, which is not quite the same thing and is why the failure is easy to miss. Flow continues, the kitchen notices nothing, and the sinks drain exactly as they did. What changes is that grease now passes through to the sewer instead of being retained.
That is where the consequences turn up: a blockage further down the system, a pollution incident, or an enforcement notice naming your discharge. By the time anyone connects it back to the interceptor, it has usually been passing grease for weeks.
Why keep the waste transfer note?
Because grease is a regulated waste and the question is not whether it left the site but where it went. The carrier holds that answer, and you cannot produce it after the fact unless you kept the numbered note at the time.
It is also the first thing asked for in an inspection, which is why the form has a column confirming the note is held rather than just a line for the collection date. The percentage in section 8 exists so you find the gaps before somebody else does.
Are enzyme or bacteria drain treatments a good idea?
Generally no, and the form has a line for it because the effect is counter intuitive. Emulsifiers and some biological dosing break grease into droplets small enough to pass straight through the interceptor, which makes the trap look cleaner while moving the problem into the sewer, where it re-forms.
Dosing of that kind is specifically prohibited in many areas for exactly that reason. If a site has quietly started dosing because servicing was reduced, the interceptor readings will look better and the discharge will be worse.
What is the most common fault this checklist finds?
A fixture plumbed around the interceptor, and the dishwasher is the usual one. It gets routed direct, often because of concerns about discharge temperature, and it sends the hottest and most emulsified grease on the site straight past the trap.
It is recorded as a High risk finding because no amount of servicing corrects it. That is why the first section asks which fixtures actually discharge through the trap rather than which ones were supposed to, and why the answer is worth walking rather than copying forward.
Does this cover an automatic grease removal unit?
Yes. The service list includes the lines a passive trap does not have: testing the skimmer, the heater and the timer, and emptying and refitting the collection container. The depth measurements and the records work the same way.
The one thing to watch on an automatic unit is that the collected grease still has to go somewhere licensed. A unit that skims continuously into a container is easier to live with, but it does not remove the need for a transfer note when the container is emptied.
Can I edit and rebrand this template?
Yes. It is free to use, edit, rename and put your own logo on, internally or for clients. No attribution required.
The Word version is the one to edit if you want the service list to match your own procedure or your contractor’s method statement. The Excel version is the one to use if you want the Service Log tab, which takes the volume removed against the days elapsed and gives you the accumulation rate that should be setting the interval.
In one paragraph
A grease trap maintenance checklist is a measurement record first and a task list second. Start with what actually discharges into the interceptor, because a dishwasher plumbed around it defeats everything that follows. Measure the liquid depth, the grease layer and the solids before anything is removed, and pump when the two layers together reach a quarter of the depth. Empty it fully rather than skimming, because the solids are what has already taken the working volume. Keep the numbered transfer note for every service, since where the grease went is a regulated question answered by the carrier and not by you. Walk the kitchen practice, watching for drain dosing that moves grease downstream while making the trap look better. Then divide the volume removed by the days elapsed, and let that accumulation rate set the next interval instead of the contract.
The template is the floor, not the ceiling
Take the checklist; it will run one service properly and give an inspector something to read. When a folder of sheets and a separate pile of transfer notes stops being enough, a connected CMMS runs the regime: every interceptor an asset with its depths and its history, intervals that follow measured accumulation rather than a contract default, transfer notes attached to the service that produced them, and the documentation question answered as a report rather than reconstructed from a year of paper.
