Grease Trap Maintenance Checklist: Daily, Weekly & Monthly Tasks

Reviewed September 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 two things: a professional pump-out schedule, and a routine that holds between pump-outs. The second one is where most operations slip. A trap that gets serviced on time but ignored in between still produces odors, slow drains, and failed inspections — because the daily habits of the kitchen decide how fast the trap fills and how well it works.

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. Most municipal FOG programs require a trap to be cleaned before the combined depth of floating grease and settled solids reaches 25% of the trap's total liquid depth. 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 cities pair the percentage with a fixed maximum interval, such as weekly minimum cleaning for interior traps.

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 has you measure monthly: 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.
• Do a ten-second nose-and-eyes check at close. A sewage or rancid smell near the drains or the trap that wasn't there yesterday is your earliest warning sign.

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. Ten minutes, 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 usually points at 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. Municipal BMP guidance calls for wash water under 140°F, because very hot water liquefies grease and carries it through the trap into the sewer line before it can separate out.
• Confirm mop water and mat cleaning go through a utility sink connected to the trap — not a storm drain, and not the parking lot.
• Initial the maintenance log. A weekly line — date, initials, anything unusual — is the cheapest compliance protection you can buy.

Monthly Grease Trap Maintenance Checklist

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

• Measure — or have your service company measure — the combined depth of floating grease and settled solids, and compare it to your trap's total liquid depth. Past 25%, or past whatever trigger your local ordinance sets, 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 five-minute staff refresher. Municipal FOG programs expect employee training to be documented and ongoing. 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 a standard item in municipal BMP lists, 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 a month (or quarter) when maintenance is out of your hands — which is exactly why municipal BMP lists 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 municipal 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 and shouldn't be the same price; 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. The service record or manifest should show the date, volume removed, the hauler's identity, and where the waste is going. An invoice alone is not automatically 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

If you can't prove it, the inspector treats it as not done. One binder or one shared folder, four sections:

1. Service manifests / pump-out records — every visit, filed by date. Retention requirements vary by city; three years is a common floor, and some programs require longer, so check your ordinance and keep them longer when in doubt.
2. The in-house log — your weekly initials, monthly measurements, and anything unusual, in one place. Municipal BMP lists specifically 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. Documented training is an expected best practice in municipal programs, and it's the first thing that shows an inspector your kitchen takes this seriously.

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. 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. The federal Occupational Safety and Health Administration documents deaths and serious injuries around grease traps — unsecured covers, falls, toxic and flammable gases, and confined-space hazards (OSHA 3986, "Preventing Worker Deaths from Grease Trap Hazards"). So:

• No one untrained opens a trap or interceptor, leans over an open one, or ever enters one. Interior under-sink units have their own rules per the equipment manual; large or outdoor units are professional territory, full stop.
• No DIY disposal. Grease and solids removed from a trap generally can't go in the trash or any drain — disposal runs through approved haulers and facilities. What you can legally and safely do in-house is covered in the DIY grease trap maintenance guide.
• No chemical shortcuts. Degreasers and solvents that emulsify grease push it through the trap into the sewer — some municipalities restrict them outright. Additives never substitute for physical cleaning.

How Often Each Layer Applies to Your Kitchen

The daily, weekly, and monthly layers above apply to every commercial kitchen with a trap. What varies is the professional service interval underneath them: a fry-heavy quick-service kitchen may need pump-outs several times more often than a coffee shop 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); and 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). 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), monthly measurement (comparing the combined grease and solids depth against the 25% threshold most municipal FOG 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 habits and a weekly walk-through are standard practice in municipal best-management-practice guidance. A depth measurement of accumulated grease and solids 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 maximum service interval — some cities require interior traps to be cleaned weekly at 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 clean small interior traps, while exterior interceptors almost always require a licensed or city-approved hauler with a vacuum truck. In either case the removed grease and solids must be disposed of through an approved route — FOG waste generally cannot go in the trash or any drain. Check your municipality's FOG program before assigning trap cleaning to staff.

What grease trap records do inspectors ask for?

Inspectors commonly 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. Municipal best-management-practice guidance also calls for documented staff training. Retention periods vary by city — three years is a common requirement — 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 municipalities restrict products that emulsify grease because it then passes through the trap into the sewer. Physical removal on a schedule — pumping or manual cleaning, depending on the device — remains the required maintenance method under municipal FOG programs. If you use a biological treatment, treat it as a supplement between cleanings, never as a substitute.

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.