Grease trap cleaning in Australia is priced per litre of trap capacity, about A$0.19 to A$0.46 plus GST, with a minimum billed as a 1,000 litre service, so most restaurant pump outs land between A$225 and A$450 a visit.
Skai Solutions publishes this because the pump out invoice is the part operators see, and it is not the whole cost. The water utility decides how often the trap is emptied, charges a separate quarterly fee for having one, and charges a much higher rate per kilolitre if the trap stops working. Figures below are dated and sourced. Prices are the market as advertised in September 2026, not a quote.
Almost every commercial waste contractor in Australia prices the same way: cents per litre of trap capacity, with a minimum charge equal to servicing a 1,000 litre trap no matter how small yours is. That minimum is why a 600 litre trap and a 1,000 litre trap often cost the same to empty.
| Line | Advertised range, September 2026 | What it means for you |
|---|---|---|
| Per litre rate, national spread | A$0.19 to A$0.46 plus GST | Position in the range tracks distance from a waste transfer station more than trap size |
| Per litre rate, Sydney | about A$0.20 to A$0.26 plus GST | The most competitive market in the country |
| Minimum charge, 1,000 litre service, Sydney | about A$225 to A$280 | Billed even if the trap holds less |
| 1,000 litre pump out, Melbourne | about A$250 to A$450 | The gap is access, not the trap |
| Per litre rate, Perth and Darwin | about A$0.19 and about A$0.35 plus GST | Distance shows up plainly |
Read from several Australian commercial waste and grease trap servicing providers' own published price pages on 19 September 2026. These are advertised market rates, not quotes, and they are not Skai Solutions prices. No government body in Australia publishes a grease trap pump out price, because the pump out is a private contract. The utility only sets how often it happens.
Worked example, ours, inputs shown. A 1,500 litre trap in Sydney at A$0.23 a litre is A$345 plus GST a service. On a 13 week schedule that is four services a year, A$1,380 plus GST. Move to an 8 week schedule because the trap is overloading and it becomes six and a half services, about A$2,243. The schedule, not the rate, is the lever.
You do not choose. In Sydney Water's area the frequency is set when your trade waste application is assessed and then written into the permit, and the only intervals the scheduling system accepts are 4, 8, 13 and 26 weeks. The cleaning has to be done by an approved Wastesafe transporter, so the cheapest quote on the internet is only useful if that contractor is on the list.
What moves you from 26 weeks to 4 is not how big your trap is on paper, it is how much grease actually reaches it. A venue that scrapes plates into a bin, keeps a bucket trap in the sink and never tips fryer oil down the drain holds a longer interval on the same trap than one that does not. The frequency is reviewable, which means an operator who cleans up their kitchen practice has something to ask for.
Sydney Water, Grease traps and other pre-treatment, read 19 September 2026. Other states run their own schemes: check your own water utility before you rely on any of this.
The pump out is the visible cost. These are the ones that arrive quarterly and never get looked at. Sydney Water's published rates for 1 July 2026 to 30 June 2027:
| Charge | 2025-26 | 2026-27 |
|---|---|---|
| Liquid waste (grease) trap charge, per trap | A$7.31/qtr | A$7.61/qtr |
| Trade waste permit, first process | A$30.66/qtr | A$31.91/qtr |
| Trade waste permit, each extra process | A$9.71/qtr | A$10.11/qtr |
| Low strength BOD food, per kilolitre discharged | A$2.670 | A$2.826 |
| Agreement non compliance fee | A$141.23 | A$152.31 |
| Additional inspection | A$254.51 | A$264.94 |
Sydney Water trade waste fees and business pricing, read 12 September 2026. Trade waste prices are set by IPART, not by the utility.
Add them up and the standing cost of simply having a grease trap and a permit in Sydney is A$39.52 a quarter, A$158.08 a year, before anyone drives a truck to your door. That is small. It is worth knowing it exists because the next number is not small.
This is the figure that should decide how you treat the schedule. Sydney Water charges a food business on low strength BOD food A$2.826 a kilolitre in 2026-27. A food business "where pre treatment is not maintained" is charged A$20.061 a kilolitre. That is 7.1 times the rate, and it is our arithmetic on the two published numbers, not a claim they make.
It is charged on every kilolitre you discharge, for as long as the trap is not doing its job. A venue pushing 15 kilolitres a week goes from about A$42 a week to about A$301. Over a quarter that is roughly A$3,400 of avoidable charge, which buys ten pump outs. Add the A$264.94 additional inspection and the A$152.31 non compliance fee and the arithmetic stops being close.
The failure that causes it is almost never the trap. It is a blocked line, a bucket trap nobody empties, or fryer oil going down a sink because the drum was full on a Friday. Those are roster and routine problems, which is the same category as pest control failures and exhaust cleaning falling behind.
An overflowing trap is almost never a trap that is too small. It is a trap that is full, a line that is blocked downstream of it, or an inlet baffle that has moved. Work through it in that order, because the first two you can see in ten minutes and the third needs the lid off.
| What you are seeing | Most likely cause | What to do first |
|---|---|---|
| Water backing up in the kitchen sink, trap lid dry | Blockage between the trap and the sewer, not the trap | Plumber on the drain line. A pump out will not fix it |
| Trap full to the lid, crust across the whole surface | Overdue pump out, or the interval is too long for your volume | Book the pump out, then ask for an interval review |
| Overflowing within days of a clean | Solids load, usually a bucket trap nobody empties or peelings going down a sink | Daily bucket trap duty on the close roster |
| Grease visibly leaving the trap into the drain | Baffle dislodged or the outlet tee is missing | Lid off, inspect internals, repair before the next discharge |
| Leaking at the lid or around the body | Perished lid seal, or a cracked in ground tank | Seal is cheap, a cracked tank is a replacement and needs utility approval |
One thing to get right before you ring anybody. An out of cycle pump out and an interval change are two different purchases. The pump out is a stopgap you pay a transporter for today. The interval is fixed in your trade waste permit on the intervals set out above, so moving from the 13 week cycle to the 8 week one is a permit variation with the utility, not a booking. If the trap is overflowing between scheduled cleans, ask for the interval review in writing on the same day you book the clean. Skip that and you buy the stopgap four times a year and the permit never changes. Use an approved transporter for the clean itself: a general plumber emptying the tank leaves you with an empty trap and no compliant disposal record.
A trap that smells is a trap holding its contents too long. The odour is hydrogen sulphide from anaerobic breakdown, so it tells you the interval is wrong for your volume rather than that anything is broken. Two things follow that are not the smell. The same condition corrodes the lid and the fixings, which is how a cheap asset turns into a replacement. And odour reaching a neighbour is a nuisance complaint, which runs much like the process on our page about noise complaints against a restaurant. Deodorising blocks and enzyme dosing treat the smell, not the interval. If you are dosing to get through a weekend, the interval is the problem, and the pattern is usually a close down routine nobody owns, the same way a commercial dishwasher stops working or a venue loses hot water on a Saturday.
Sizing is done on your maximum hourly flow, now and allowing for what you might add later, and it has to be approved before installation. Three rules from the Sydney Water requirements are worth knowing before you sign a fit out contract, because each of them is expensive to fix afterwards.
Two more that decide your ongoing bill: the trap should drain by gravity to the sewer, because pumping into a trap is the least preferred design and fails messily, and the tanker has to be able to park near it. A multi storey site usually needs a fixed pump out line run to street level. All of this belongs in the fit out budget, not in year two.
Ordered by what they cost you to do, not by how much they save.
If you have cleaned up practice, had the schedule reviewed and shopped the contract and the bill is still wrong, the trap is probably undersized or wrongly installed for what the kitchen now does. A venue that added a fryer, a wok line or a second service does not have the same hourly flow it was sized for. That is a plumbing and approval job, and it is worth pricing against the cost of staying on a 4 week schedule forever.
Before you spend anything, check the charge codes on your own bill against the published rates above. The gap between A$2.826 and A$20.061 a kilolitre means it is worth knowing which one you are actually on, and operators rarely look.
Grease trap rules are set by the water utility for your area, not nationally, so the Sydney Water figures above are an example of the shape rather than the law where you are. Start with your own utility's trade waste pages, then your last four invoices. This page is general information about published rates, not advice about your site.
The wider cost picture is on what a restaurant water bill actually costs, restaurant overhead costs and restaurant food waste rules.
The pump out is only one line. The permit, the volumetric charge and the quality charge arrive on the utility bill instead, and the penalty rate for a trap found not to be maintained is seven times the normal rate in Sydney. Those figures are on our page on trade waste charges in Australia.
A trap pump out, an exhaust clean and a nightly floor clean are three separate trades that often arrive bundled into one quote. The hourly side of that bundle, and the published wage floor every cleaning quote has to cover, is on restaurant cleaning cost in Australia.
It comes in at the point where nobody answers it. The Wastesafe contractor rings to confirm a window. The plumber rings back about the certificate. The utility's business team rings about the permit. All three ring between 10am and 3pm, which for a restaurant is prep and lunch, and a missed call there turns a fifteen minute job into another week on a worse schedule.
Skai Solutions answers the phone when the kitchen cannot, takes the message with the detail intact and sends it to you, and takes bookings and orders at the same time. Setup takes five days. What it costs is on the pricing page, and the reasoning behind the number is on what an AI receptionist costs.
How much does grease trap cleaning cost for a restaurant? Advertised Australian rates in September 2026 run about A$0.19 to A$0.46 a litre plus GST, with a minimum charge equal to a 1,000 litre service. Most single restaurant pump outs are quoted between A$225 and A$450.
How often should a restaurant grease trap be cleaned? The water utility decides. In Sydney Water's area the permit sets it and the only intervals accepted are 4, 8, 13 and 26 weeks. A busy kitchen that does not control what reaches the trap will be at the short end.
Do I need a grease trap for a small cafe? If you discharge trade wastewater, yes. Sydney Water requires most retail food businesses to install in sink and in floor bucket traps, a correctly sized grease trap and backflow prevention. Approval comes before installation, and a licensed plumber must do the work and issue a certificate of compliance.
What is the biggest grease trap I can install? A single grease trap is capped at 5,000 litres. A complex needing 30,000 litres or more of total capacity must use centralised pre treatment such as dissolved air flotation, with a discharge meter and a sampling point beside it.
What happens if I skip a pump out? Charges change category. A food business where pre treatment is not maintained is charged A$20.061 a kilolitre in 2026-27 against A$2.826 for low strength BOD food, about 7.1 times the rate, on top of a A$264.94 additional inspection and a A$152.31 non compliance fee.
Can I use any waste contractor? Not in Sydney Water's area. The trap has to be emptied by an approved Wastesafe transporter, so check the list before you take a quote.