A Sydney restaurant pays A$7.74 a kilolitre once the three separate water charges are added up, which is 2.3 times the A$3.41 drinking water rate most people quote. Skai Solutions puts a 150 square metre cafe at about A$1,324 a year on Sydney Water's published 2026-27 figures.
The reason the headline rate misleads is that a food business is billed three times for the same litre: once to bring it in, once to take it away, and once more as a trade wastewater quality charge that only applies because you cook. All the figures below are published rates for 1 July 2026 to 30 June 2027, not estimates, and the New Zealand comparison further down flips the structure completely.
A grease trap is the other trade waste cost that arrives on the same bill, and it is priced separately: see what grease trap cleaning costs a restaurant for the per litre rates, the pump out schedule the utility sets, and the charge that applies when a trap is not maintained.
These are Sydney Water's published non-residential charges for 2026-27. A kilolitre is 1,000 litres.
| Charge | 2025-26 | 2026-27 | Applies to |
|---|---|---|---|
| Drinking water usage | A$3.17 | A$3.41 a kilolitre | Every metered business |
| Wastewater usage | A$1.44 | A$1.50 a kilolitre | Every non-residential customer |
| Trade waste quality, low strength food | A$2.670 | A$2.826 a kilolitre | Restaurants, cafeterias, food courts, takeaway |
| Total for a restaurant | A$7.284 | A$7.736 a kilolitre | The number to budget on |
Sydney Water's trade wastewater fee schedule names the categories explicitly. "Low strength BOD food" covers restaurants, food courts, takeaway food outlets including burger and pizza restaurants, cafeterias and canteens, function centres, and hotel and motel kitchens. "High strength BOD food" is A$3.906 a kilolitre and covers fried chicken outlets above 2,000 mg/L a day, Asian-style barbecues, ice cream parlours and some retail bakeries. Those charges are set by the Independent Pricing and Regulatory Tribunal, not by Sydney Water.
Add the fixed charges. A 20 mm meter is A$26.65 a quarter in 2026-27, a commercial trade waste permit is A$31.91 a quarter for the first process, and a grease trap carries A$7.61 a quarter in administration. That is A$66.17 a quarter, A$264.68 a year, before the wastewater service charge that also applies and varies by property.
One genuinely good piece of news in the 2026-27 schedule, and it is the opposite of what every other bill did this year: the fixed water service charge fell. A 20 mm meter dropped from A$29.73 a quarter to A$26.65, and a 25 mm from A$46.45 to A$41.63. The usage rates rose. So a low-volume venue on a small meter is better off than last year and a high-volume one is worse off.
Sydney Water publishes a benchmark for this, in its non-residential water usage guideline, version 3, issued 25 March 2025. It rates "cafe, fast food, butcher, deli" at 2.5 litres per square metre of building area per day. An office is 0.4 litres per square metre. So a cafe uses 6.25 times as much water per square metre as an office of the same size, which is the number to quote when a landlord bundles water into outgoings on a floor-area basis.
For a hotel or motel the guideline switches metric entirely and rates 390 litres per room per day. A club, a laundry and a carwash all require a bespoke calculation, which tells you the guideline stops being useful the moment the water is doing something other than cooking and cleaning.
Take a 150 square metre cafe in the Sydney Water area, trading seven days.
The inputs are Sydney Water's benchmark and Sydney Water's rates. The multiplication is ours, and your own bill is the only authority on your own volume. Read it rather than trusting this, because building area is a crude proxy for a kitchen: two rooms of the same size running a wok section and a sandwich bar do not use the same water.
This is the line item almost nothing written about restaurant running costs carries, and it is the largest single number on this page. Sydney Water's 2026-27 schedule sets one rate for food businesses where pre-treatment is maintained and another where it is not. Where pre-treatment is not maintained, the charge for both high and low strength food is A$20.061 a kilolitre.
That is 7.1 times the A$2.826 a compliant restaurant pays. For the 150 square metre cafe above, the usage charges go from A$1,058.87 a year to A$3,417.91, an extra A$2,359.04. The per-kilolitre stack goes from A$7.736 to A$24.971, which is 3.2 times as much for exactly the same water.
So the arithmetic on a grease trap is not "cleaning costs money". It is that the cleaning is cheaper than the tariff you move onto when you skip it, and the tariff applies to every litre for as long as you are on it. Sydney Water also requires a licensed Wastesafe transporter to do the pump-out at a frequency it sets, so this is not a schedule you choose. There is a separate A$152.31 agreement non-compliance fee and A$264.94 per additional inspection.
Auckland charges more per kilolitre and charges it a completely different way. Watercare's business schedule effective 1 July 2026 puts water at NZ$2.46 a kilolitre including GST, and wastewater on a tiered plan: NZ$8.01 a kilolitre plus a NZ$355.90 annual fixed charge on the low user plan, which covers any business discharging under 1,309 kilolitres a year. That is almost every single-site cafe. Combined, the variable rate is NZ$10.47 a kilolitre.
Two structural differences, and both matter more than the headline gap.
The pipe out costs more than the pipe in. In Auckland wastewater at NZ$8.01 is 3.3 times the water charge at NZ$2.46. In Sydney wastewater usage at A$1.50 is 0.44 of the water charge at A$3.41. So water efficiency advice written for one country points at the wrong tap in the other: in Auckland the money is in what goes down the drain, in Sydney the money is in what comes out of it, plus the trade waste line.
Auckland has no separate trade waste tariff. Watercare states plainly that trade waste is now charged as wastewater under the business wastewater tariff, so there are no separate carriage and treatment charges, only administration and monitoring. A cafe therefore pays the same rate per kilolitre as an accountant's office upstairs. Sydney does the opposite and prices your kitchen by what it discharges. Neither is obviously fairer, but only one of them can punish you 7.1 times over for a dirty grease trap.
The smallest venues pay the highest unit rate. Watercare's low user plan at NZ$8.01 a kilolitre is 1.6 times the NZ$5.01 an industry plan customer pays. The fixed charge is far lower, which is the trade-off, but a growing venue crossing 1,309 kilolitres moves onto the moderate plan at NZ$7.60 and a NZ$893.37 fixed charge, so the step is worth modelling before you add a second kitchen.
In order of how much they usually return, cheapest first.
If none of that moves the number, the honest answer is that water is rarely where a struggling venue's money is going. At about A$1,300 a year the whole water bill for a small cafe is smaller than one week of wages. Rent as a percentage of turnover and labour cost percentage are both an order of magnitude larger, and food cost percentage larger still. Spend the afternoon there instead.
It does not, much, and pretending otherwise would be dishonest. Water is a fixed feature of the building and the menu. The one real connection is over-preparation: food cooked for covers that never arrived was washed, cooked and then scraped into a bin you also pay to empty, and a venue that cannot answer its phone has a worse picture of how many people are coming than one that can. That is the same argument as restaurant food waste, and it is a small effect next to spoilage and over-ordering.
If your water bill is the biggest thing on your mind this week, a phone agent is not what you need. If the thing on your mind is that the phone rings through service and nobody gets to it, that is what Skai Solutions is for.
Water, power and waste are fixed whether the room is full or empty. The phone is the one line that decides whether it is full. Skai Solutions covers how that works on our AI receptionist page, and setup takes five days. For a line item you can compare it to, see the monthly cost of an AI receptionist.
Water hardness drives cost as well as volume, because it decides how hard your machines work. The bands are set out on how a commercial glass washer works and on why an ice machine stops making ice.
The trade waste side of that bill is priced completely differently in each state, and the schedules are worth reading side by side. We have put the 2026-27 Sydney Water, Yarra Valley Water and Logan City numbers together on one page about what trade waste charges cost a food business.
Every figure here is Sydney Water or Watercare, and every water authority sets its own prices. Melbourne, Brisbane, Perth, Wellington and Christchurch all differ, and outside the metropolitan networks a venue may be on tank water and trade waste rules set by a council. Prices change on 1 July in both countries, so a figure without a date is a claim about the past. Check your own retailer's current schedule before you budget on anything above.
Skai Solutions is not a plumber, a water auditor or a trade waste consultant. If your bill has jumped and you cannot see why, Sydney Water runs a free desktop assessment for business customers and Watercare publishes its own schedules. Start there.
Water is one of three utility lines and the other two are priced differently again. Restaurant electricity cost sets out the regulated Australian rates for 2026-27, the New Zealand survey figures, and why no average gas bill for a restaurant exists anywhere.
Hot water is the half of the water bill that can also close your kitchen. Can a restaurant trade with no hot water covers what the Food Standards Code actually requires and four fixes ordered cheapest first.
The single biggest water user in most kitchens is the dishwasher, and what a commercial dishwasher costs to run prices it against the same three charge stack.
On Sydney Water's 2026-27 rates a restaurant pays A$7.736 a kilolitre in usage charges, made up of A$3.41 drinking water, A$1.50 wastewater and A$2.826 trade waste quality, plus fixed charges of about A$66.17 a quarter on a 20 mm meter with one grease trap. Skai Solutions puts a 150 square metre cafe at roughly A$1,324 a year using Sydney Water's own benchmark of 2.5 litres per square metre a day.
Yes. Restaurants pay a trade wastewater quality charge on top of ordinary water and wastewater usage, because kitchen discharge carries more organic load than domestic sewage. On Sydney Water's 2026-27 schedule that charge is A$2.826 a kilolitre for restaurants, cafeterias, food courts and takeaway outlets, and A$3.906 for higher strength categories.
Sydney Water's non-residential water usage guideline, version 3 issued 25 March 2025, rates cafes, fast food outlets, butchers and delis at 2.5 litres per square metre of building area per day. A 150 square metre cafe is therefore about 375 litres a day, or 136.9 kilolitres a year. Hotels and motels are rated separately at 390 litres per room per day.
The most likely reason is that pre-treatment was found not to be maintained. Sydney Water's 2026-27 rate for food businesses in that state is A$20.061 a kilolitre against A$2.826 where the grease trap is serviced, which is 7.1 times as much, and it applies to every litre. There is also a A$152.31 agreement non-compliance fee and A$264.94 for each additional inspection.
No, on a per kilolitre basis it is dearer. Watercare's business schedule from 1 July 2026 puts Auckland water at NZ$2.46 a kilolitre and low user plan wastewater at NZ$8.01, so NZ$10.47 combined, against A$7.736 in Sydney. The structure differs too: Auckland folds trade waste into the wastewater tariff, so a cafe pays the same unit rate as an office.