Grease Trap Maintenance Checklist: Daily, Weekly & Monthly Tasks

Reviewed October 2026 by the GreaseTrapLocator editorial team. GreaseTrapLocator is a publisher and directory — we don't perform grease trap service. Local ordinances and equipment instructions control where they apply.

Every kitchen that runs a grease trap needs a service schedule that fits its equipment and local rules, plus kitchen habits that keep grease out of the drains between services. The second one is the easier one to let slip. A trap that gets serviced on time but ignored in between can still cause odors, slow drains and inspection problems, because the kitchen's daily habits affect how fast the trap fills.

This page is that routine, written as a working checklist: what to do daily, weekly, monthly, and at every service visit, plus the records an inspector will expect to see. It's built from municipal FOG-program guidance (sources at the bottom of the page) and is meant to be adapted, not followed blindly — your city's ordinance and your equipment manual always control. If your trap is already overflowing, skip this page and go straight to the grease trap overflow emergency checklist.

For the full maintenance program — schedules by kitchen type, costs, the 25% rule in depth, and common mistakes — see our grease trap maintenance guide. For a printable calendar you can post in the kitchen, use the maintenance schedule template.

How to Use This Checklist

Two numbers anchor everything below.

The 25% threshold. Some municipal FOG programs use a 25% trigger: the trap must be serviced when the combined depth of floating grease and settled solids reaches 25% of its liquid depth. Sioux City applies it to exterior interceptors, and Seattle uses it when the manufacturer's specifications are not available. The City of Sioux City's wastewater plant publishes a worked example: half a foot of grease on top plus a foot of solids on the bottom in a four-foot trap is 37.5% — past the limit, and the kitchen needs to pump more often (Sioux City WWTP, "Understanding Grease Removal and the 25% Rule"). Confirm the exact trigger in your own ordinance — some programs pair the percentage with a fixed interval. Sioux City, for example, requires interior traps to be maintained weekly at a minimum, or at 25%, whichever comes first.

Your fill rate. The U.S. EPA's pretreatment guidance for food service establishments notes that how often an interceptor needs maintenance depends greatly on how much fat, oil, and grease the facility generates and the practices it uses (EPA fact sheet, "Controlling Fats, Oils, and Grease Discharges from Food Service Establishments"). That's why this checklist includes a monthly fill-level reading by your service company: the measurement, not the calendar, tells you whether your schedule fits your kitchen. Our cleaning frequency guide covers how to translate fill rate into a schedule.

Daily Grease Trap Maintenance Checklist

These are kitchen-habit items, not trap work. They come almost directly from municipal best-management-practice lists — Sioux City's FOG program publishes eighteen of them — and they matter because every gram of grease your staff keeps out of the drain is capacity your trap keeps.

• Scrape and dry-wipe pots, pans, plates, and utensils into the trash before washing. Paper towels and scrapers capture grease that would otherwise go down the drain.
• Empty sink strainers and floor-drain screens into the trash. Confirm every sink has its strainer in place — a missing strainer sends food solids straight to the trap bottom.
• Keep all cooking oil out of the drains. Used fryer and cooking oil goes into the sealed collection container for your oil recycler, never into a sink or floor drain. (Not sure what counts? See fats, oils, and grease explained.)
• Clean up grease spills with absorbent material — pads, rags, or granular absorbent — and put it in the trash. Don't hose spills toward a floor drain.
• Sweep floors before wash-down so food debris goes out as solid waste instead of into the drain system.
• Notice any new sewage or rancid smell near the drains at close and note it in the log — it can be a sign the trap needs service. Smell is not a reliable warning, so never open or lean over the trap to check; call your service company.

Weekly Grease Trap Maintenance Checklist

Once a week, someone — a manager, not whoever drew the short straw — walks the FOG path from dish pit to trap, on the same day every week.

• Clean the removable strainer baskets and screens thoroughly, not just empty them. Caked-on grease on a strainer means it's passing more than it's catching.
• Check every kitchen drain for slow drainage or gurgling. One slow sink might be a local clog; several at once can point to the trap. Our guide to the signs a grease trap is full covers how to tell the difference.
• Look at the trap lid or covers from the outside. Confirm they're seated, undamaged, and not leaking odor. Do not open or lean over a trap to inspect it — see the safety section below.
• Check wash-down habits. Sioux City's BMP list, for example, calls for wash water under 140°F, and EPA explains that interceptors work by letting grease cool and separate. Don't lower the washing and sanitizing temperatures your food-safety rules and dishwasher instructions require.
• Check where mop water and mat-cleaning water go. Sioux City's BMP list directs them through a utility sink connected to the grease trap; confirm the approved fixture and routing for your kitchen with the local authority, and keep this water out of storm drains and parking areas.
• Initial the maintenance log. A weekly line — date, initials, anything unusual — is a simple record that the checks were done.

Monthly Grease Trap Maintenance Checklist

The monthly items are about measurement and trend, because a trap fails gradually and then suddenly.

• Have your service company — or a person trained for the task under your equipment manual — measure the combined depth of floating grease and settled solids and compare it to the trap's liquid depth. Staff who are not trained for it should not open or measure inside the trap. If it has reached your local trigger (25% where your program uses that rule), the trap needs service now, not at the next scheduled visit.
• Record the measurement and compare it to last month. Filling faster than usual? Something changed — a new fryer, a busier season, a missing strainer. Filling much slower than expected at every service? You may be paying for pump-outs you don't need yet; see how to save on grease trap cleaning before changing anything, and confirm your ordinance allows a longer interval.
• Confirm the next pump-out is actually booked — on the calendar, with a confirmed date from the hauler, not "sometime next month."
• Run a short staff refresher. Sioux City's BMP list, for example, calls for initial and continued employee education at least once a year, with the training documented. New hires since last month? They need the scrape-don't-rinse talk on day one.
• Check that FOG signage is up and legible at the dish pit and near the fryers — posted signage is on BMP lists such as Sioux City's, and it does the training work when you're not there.

Per-Service Checklist: Every Pump-Out Visit

The service visit is the one day when maintenance is out of your hands — which is why some municipal BMP lists, Sioux City's among them, tell operators to witness it. Here's your side of the visit:

• Be there, or assign a manager to be there. Witnessing the cleaning is a named best practice in Sioux City's FOG guidance, and it's how you know what you paid for actually happened.
• Know what service you agreed to. A full pump-out removes everything — grease cap, water, and solids. A skim removes only the top layer. They are not the same service, so confirm which one your quote includes; our pages on cleaning vs. pumping and grease trap pumping explained cover the difference in plain terms.
• Use the service-verification checklist while the crew works. Our grease trap cleaning checklist is a separate, printable walkthrough of what to confirm about the work itself — access, scope, documentation — without getting in the crew's way. (What actually happens inside the truck-and-hose part of the visit is covered in the grease trap cleaning process.)
• Collect the paperwork before the truck leaves. Ask for the service record or manifest, and check it has what your local program requires — for example the date, the amount removed, the hauler and where the waste went. An invoice may not count as a manifest.
• Ask one question every visit: "Anything look wrong in there?" Crews see baffles, tees, and lids on every job. A verbal heads-up about a damaged baffle, noted in your log, can get a small repair done before it becomes a failed inspection.
• Twice a year, think seasonally. Cold weather changes how grease behaves in outdoor lines and traps — the winter maintenance guide covers what to add to this checklist from late fall onward.
• Sanity-check the interval. If measurements say the trap hits its threshold well before each visit, shorten the interval; the service frequency guide explains how local rules constrain that decision.

Record-Keeping Checklist: What Your File Must Contain

Records are how you show an inspector the work was done. One binder or one shared folder, four sections:

1. Service manifests / pump-out records — every visit, filed by date. Retention periods vary by program and permit, so check your ordinance and keep records longer when in doubt.
2. The in-house log — your weekly initials, monthly measurements, and anything unusual, in one place. BMP lists such as Sioux City's call for a log of cleaning frequency and maintenance of the grease control device.
3. Permits and notices — your interceptor permit if your authority issues one, plus any inspection reports or violation notices and what you did about them.
4. Training records — dates and attendees of staff FOG training. Some programs, such as Sioux City's, ask for training documentation to be kept accessible.

When Not to Wait for the Checklist

Checklists are for routine. Some situations are not routine: greasy water backing up into sinks or floor drains, sewage odor throughout the kitchen, or standing water around an outdoor trap. Those call for a service visit now — same day if you can get it — not a note in the log. If sewage backs up into the kitchen, close the food establishment immediately as a precaution and contact the health authority for instructions on cleanup and reopening. The full symptom-by-symptom walkthrough is in signs your grease trap is full.

What Stays Off Your Checklist: Safety and Legal Limits

A maintenance checklist for kitchen staff deliberately leaves things out. OSHA's hazard bulletin on grease traps warns that workers can trip over unsecured lids or fall in, and that traps can give off flammable and toxic gases, present engulfment hazards and be permit-required confined spaces (OSHA Hazard Bulletin 3986, "Grease Trap Hazards"). So:

• Kitchen staff do not open, lean over, measure inside or enter a trap or interceptor. Small interior units follow the equipment manual and your local rules, and only staff trained for that task should service them; large and outdoor interceptors are work for a service company. Smell is not a reliable warning. Evaluate hydrogen-sulfide and confined-space hazards and apply the monitoring, training, entry controls and respiratory protection required by the applicable standards and site assessment.
• No DIY disposal. Removed grease and solids must never go down a drain. Follow your local program's disposal rules — some, like Sioux City's, approve specific haulers for pump-outs. What you can legally and safely do in-house is covered in the DIY grease trap maintenance guide.
• No chemical shortcuts. Products that emulsify grease can carry it through the trap into the sewer, and some cities ban them — Seattle, for example, does not allow emulsifying agents, enzymes or bio-additives in grease interceptors. Additives are no substitute for physical cleaning.

How Often Each Layer Applies to Your Kitchen

Adapt these daily, weekly and monthly checks to your equipment, its actual fill rate and your local rules; a monthly reading may be too infrequent for some traps, and Sioux City, for example, sets weekly cleaning for interior traps. The service interval also varies: a kitchen that sends more grease toward the drain will need pump-outs more often than one that sends less, even with the same size trap. The starting-point intervals by kitchen type are in the cleaning frequency guide, the local-compliance side is in the service frequency guide, and what those visits should cost is in the cleaning cost guide.

Sources and Method

This checklist is compiled from public guidance, primarily: the U.S. EPA's pretreatment fact sheet for food service establishments (Controlling Fats, Oils, and Grease Discharges from Food Service Establishments); OSHA's hazard bulletin for grease traps (OSHA 3986); the City of Sioux City wastewater plant's FOG program materials, including its 18-item best-management-practices list and 25%-rule explainer (Understanding Grease Removal and the 25% Rule); and Seattle Public Utilities' FOG page for commercial kitchens (Fats, Oils, & Grease: Commercial Kitchens). Municipal requirements vary; where this page and your local ordinance differ, the ordinance wins.

Frequently Asked Questions

What should a grease trap maintenance checklist include?

A complete checklist covers four layers: daily kitchen habits (scraping and dry-wiping cookware, emptying sink strainers, keeping cooking oil out of drains), weekly checks (slow drains, odors, lids seated and undamaged, checked from the outside), a monthly fill-level reading by your service company (comparing the combined grease and solids depth against your local trigger, such as the 25% rule some programs use), and per-service verification (witnessing the pump-out, collecting the manifest, filing the record). Record-keeping runs through all four layers.

How often should I check my grease trap?

Daily kitchen habits and a weekly walk-through from the outside are good practice; some programs, such as Sioux City's, build daily items like emptying sink strainers into their BMP lists. A depth reading by your service company about once a month tells you how fast the trap is filling and whether your pump-out schedule fits your kitchen. Your local ordinance may also set a fixed service interval — Sioux City, for example, requires interior traps to be maintained weekly at a minimum — so verify the local rule and treat it as the floor, not a suggestion.

Who is allowed to clean a grease trap?

It depends on the device and your local rules. Some cities allow trained kitchen staff to service small interior traps; Sioux City, for example, requires a certified hauler for exterior interceptors. Removed grease and solids must never go down a drain, and your local program sets the disposal rules. Check your municipality's FOG program before assigning trap cleaning to staff.

What grease trap records do inspectors ask for?

Inspectors may ask for service manifests or pump-out receipts from your hauler, your in-house cleaning and inspection log, and any permit your wastewater authority issued for the interceptor. Some programs, such as Sioux City's, also call for documented staff training. Retention periods vary by program and permit, so check your local ordinance and keep everything in one binder or folder you can produce during an inspection.

Do enzyme or bacteria additives replace grease trap cleaning?

No. Additives do not remove accumulated grease and solids from the trap, and some cities ban them — Seattle, for example, does not allow emulsifying agents, enzymes or bio-additives in grease interceptors. Physical removal on a schedule — pumping or manual cleaning, depending on the device — is what takes the grease and solids out. Check your local rules before using any additive.

Next steps: print a calendar version from the maintenance schedule template, read the full grease trap maintenance guide for schedules and costs, or find a grease trap service provider near you in the directory.

Author: Grease Trap Locator Editorial Team

The Grease Trap Locator editorial team covers FOG compliance, grease trap maintenance, and commercial kitchen regulations across the US and Canada. Our guides are written for restaurant owners, facility managers, and food service operators who need practical, accurate information without the fluff.