Are composting toilets legal in Australia? State by state (NSW, QLD, VIC, WA, SA, TAS, NT), which models are approved, and what one costs in 2026

There are two composting toilet markets in Australia and they barely overlap. One is the caravan market, where an OGO or a Nature’s Head bolts into a van, gets reviewed enthusiastically on YouTube, and works. The other is the dwelling market, where the toilet is a sewage management facility, your council has to approve it, and the approval turns on a document most buyers have never heard of. Buy from the first market for the second purpose and you own an expensive object your council cannot sign off.

The register decides, not the review

NSW Health maintains a register of accredited waterless composting toilets. Each accredited model carries a certificate number and an expiry date, and the whole list fits on one screen.

We read that register directly rather than trusting a summary. OGO, Nature’s Head, Cuddy and Air Head are not on it. The one Separett entry, the Villa 9000-2 and 9010-2 under WCT017, carries an expiry of 31 December 2025 — which has passed.

Why this matters is a single sentence in the NSW Health accreditation guideline: “A council must not approve the installation or construction of a sewage management facility to which this Division applies unless the council is satisfied that the facility is to be installed or constructed to a design or plan that is the subject of a certificate of accreditation from the Director-General of the Department of Health, being a certificate that is in force.” The obligation sits on the council, under clause 41(1) of the Local Government (General) Regulation 2021, and it applies to systems for up to ten people or under 2,000 litres a day — which is to say, every house.

On top of accreditation you need two approvals from the council itself: a section 68 approval under the Local Government Act 1993 to install the system, and then, once it is in, a separate approval to operate it. The same clause does carry an owner-builder exemption, and it is narrower than the commercial pages make it sound: clause 41(2) lifts the accreditation requirement only for a facility built “as a model for the purposes of testing”, one “designed, and is to be constructed, by the owner or occupier of the premises”, or one designed by someone else “specifically and uniquely for those premises”. It exempts you from the certificate, not from the section 68 approval, and the council still has to be satisfied the design works.

Are composting toilets legal in Australia? State by state

Yes, in every state and territory, and nowhere as a thing you simply buy and bolt in. In each jurisdiction the toilet is an on-site wastewater system, which means two gates: the model has to be an approved or accredited product, and the installation needs a permit or approval from the council or the health authority before work starts. The vocabulary changes at every border; the structure does not. We read the primary page or code for each state in October 2026.

Queensland is the state where the paperwork lands on the buyer. Business Queensland’s page on on-site sewage facilities classes composting units as “dry-vault toilets” and says that “new composting toilet installations presented for sale in Queensland must comply with Part C3.4 Composting, chemical and incinerating toilets of the Queensland Plumbing and Wastewater Code”, that “consumers who purchase a composting toilet must request a written statement of compliance from the manufacturer or distributor” and submit it “to the local government with the approval application”, and that the department “won’t accept composting toilets previously approved by Queensland Health or the Environmental Protection Agency as evidence of compliance”. Part C3.4 itself, in version 2024.1 of the code, is short: a performance requirement that the toilet “protect public health by ensuring that risks associated with the dispersal of waste are minimised” and keep “surface and ground water” unpolluted, a list of deemed-to-satisfy design points from “adequate storage capacity” and “adequate ventilation” down to “the toilet must have a toilet seat” and a pedestal opening a child cannot fall through, and then one line that does the real work: “the size, determination, design, and installation of waterless composting toilets must be in accordance with AS/NZS 1546.2”. A supplier who cannot put that standard in writing cannot give you the statement the council wants.

Victoria does not keep a composting-toilet list at all. EPA Victoria’s page on the A20 permit defines an on-site wastewater management system as one that “treats sewage”, where sewage “contains human excreta, urine or toilet flush water” and “includes greywater”, and says you “need an A20 – Onsite wastewater management system permit to construct, install or alter an OWMS” of no more than “5,000 litres on any day”, applied for “from your local council before starting works”. The application “must include a copy of a valid certificate of conformity for the system” to AS/NZS 1547:2012, which the manufacturer supplies; councils enforce Part 5.7 of the Environment Protection Regulations 2021 and can grant an exemption from the permit, or from the certificate for “innovative” plants. So in Victoria the question for a brand is not whether it is on a list but whether it can produce a certificate of conformity, and the question for your block is whether the greywater side of the system fits, because EPA’s guideline requires a dry toilet to be paired with a greywater treatment plant.

Western Australia publishes the clearest list in the country and the clearest warning: “only approved onsite wastewater products can be used in WA. Property owners who install an unapproved system contravene the Health (Treatment of Sewage and Disposal of Effluent and Liquid Waste) Regulations 1974.” The approved waterless toilets table, reviewed on 18 August 2026, gives each model a continuous and a weekend capacity: a Clivus Multrum CM-8 Next Gen is rated 5 people full-time and 10 for weekends, a Green Loo GT120 4 and 8, an OZ-E-POD 2 and 4, a Rota-Loo RL650 4 and 8, all certified under AS 1546.2 with expiries in 2028. A second table is the one to read before buying second-hand: the Nature Loo Classic range, the Ecolet 15e and the Separera units sit under “certification not provided as of 21 September 2023”, the Incinolet WB 1800 expired on 22 July 2022, the Cinderella Freedom was “returned unapproved 30 November 2023 due to lack of information”, and the Separett Villa 9000-2 and 9010-2 expired on 25 November 2025, the same models whose NSW certificate lapsed a month later.

South Australia runs on the On-site Wastewater Systems Code of April 2013, which defines a composting toilet as “a device that receives and treats human excreta, domestic organic matter and bulking agents, using natural aerobic stabilisation and disinfection processes to produce a product that is not a public health risk”, and makes two things non-negotiable. First, “approval from the relevant authority is required prior to installation or alteration of an on-site wastewater system”, the relevant authority being the local council, and “installation or alteration of a wastewater system or part thereof shall not commence without approval”; the code adds that “penalties apply” for installing without approval and that the council can “require rectification of incorrectly or illegally installed wastewater works”. Second, “a person must not sell a system for use as an on-site wastewater system unless the system is the subject of a product approval”, granted by SA Health “for a period of five years”. Section 6.5 then tells you what happens to the output: the composted material must “have completed a 12 month composting period in the composting toilet system before disposal”, “must be buried if disposal is to be on-site”, with the same setbacks as a land application area, and “excess liquid from a composting toilet shall be collected as blackwater or combined with greywater”. SA Health’s list, updated 31 July 2026, is Ecoflo and Green Loo, from the 2-person EcoLet NE Separera 30 to the 28-person Clivus Multrum CM40.

Tasmania moved its regulator on 1 October 2026: what the forums still call CBOS is now Building Standards Tasmania, and its accreditation page says that “on-site wastewater management systems are regulated in Tasmania under the Building Act 2016”, that installations “must be designed and installed by Tasmanian licensed practitioners and approved through the Plumbing Permit process”, and that “a treatment unit that is used in the design must be accredited by the Director of Building Control”. The accredited waterless composting list, updated 16 July 2026, is nine products from two suppliers, Green Loo and Ecoflo, against AS/NZS 1546.2:2017. Two Tasmanian details matter for off-grid buyers. A system “purpose built for a particular site and not offered for sale” does not need accreditation and is dealt with by the council as a “unique system”, which is the legal home of the well-engineered owner-built unit. And treated waste from a composting toilet “may be buried on-site where direct access is restricted and no root vegetables are grown”. Incinerating toilets are a different animal: the Director does not accredit them, and the National Construction Code keeps them 2 m from any building with habitable rooms.

The Northern Territory is the simplest to state and the hardest to check from a distance: a system “must be approved to use in the Northern Territory”, “all on-site wastewater systems with a design flow of up to 2,000 litres per day must be approved before they can be sold and installed”, approvals run five years, and “you must engage a licensed plumber and drainer”. The territory’s approved-products list sits behind a page accordion, so ask the plumber for the approval number rather than trusting a brochure. We have not read a primary ACT source for composting toilets and make no claim about the ACT.

The forum version of all this is a single question that has been asked, in one form or another, since 2016:

The honest answer in 2026 is: NSW, WA, SA and Tasmania publish lists and the Rota-Loo is on NSW’s and WA’s but not SA’s; Queensland and Victoria do not publish brand lists and ask for a document instead; and in every one of them the council, not the brand, signs the approval. Which is why the council approval process is worth reading before the product reviews.

Which is exactly the question people ask on the forums

It does not. It changes which paperwork. A flushing toilet brings the water utility into your project; a composting toilet brings NSW Health’s register and two council approvals. The one path with less paperwork is a caravan, and it is governed by a different document entirely: accreditation certificates say the model is approved for “use in single domestic premises in NSW”, while a toilet in a vehicle answers to Vehicle Standards Bulletin 1, whose clause 13.2.3 asks only that toilets not discharge onto the road, that closets vent to atmosphere, and that tanks into which toilets discharge contain a deodorising germicidal chemical. It sets no accreditation requirement and names no approving authority — and no government source we could find states whether a mobile installation needs council approval at all. We set out what the vehicle documents do and do not say in composting toilets in a caravan.

Tiny houses on wheels sit on the seam and fall to whichever side they are plumbed. Tasmania’s rules are explicit: a composting toilet is allowed only if it is a system accredited by what was CBOS and is now Building Standards Tasmania, complying with AS/NZS 1546.2, a DIY bucket system is not legal, a plumbing permit is required, and the council will want a plan for where the end product goes. Victoria requires council-approved waste management plans for off-grid systems under the Environment Protection Act 2017. In WA every habitable dwelling needs a wastewater system approved by the local government, and the Shire of Denmark’s policy warns that a waterless toilet and greywater system installed for a tiny home on wheels may have to be decommissioned and removed when the home leaves. Hard-plumb a THOW as your primary dwelling and it stops being a vehicle: section 68 applies, and so does the register.

What they cost, and what the price hides

An OGO Nomad is $455 and an OGO Origin $2,095. A Nature’s Head Classic is $1,895; a Cuddy $1,795 at RRP. Move to the accredited fixed systems and the numbers change shape: a Clivus Multrum CMHP is $3,900 to $3,955, the CM8 Next Gen $3,960 to $4,750, the CM14 Next Gen $6,050 to $6,500. Sun-Mar compacts sit around $3,500 — and here two sources disagree in a way worth knowing: an Australian retailer states Sun-Mar is no longer supplied here because the importer dropped the brand, while NSW Health still lists the Sun-Mar Centrex as accredited to 31 December 2028. Accredited and available are not the same thing.

Then there is installation. A self-contained unit you can carry. A central or remote system — the kind with a chamber under the floor — needs professional installation, quoted at $1,500 to $3,000, plus council application and inspection fees that vary and that no council we found puts a number on.

Running costs are trivial and everyone gets them wrong in the same direction. A coir brick is $7. Annual consumables land somewhere between $45–90 and $100–200 depending on who you ask. The real recurring cost of a composting toilet is not money, it is attention.

1. The vent stack. It carries moisture and odour up and out. The fan runs continuously; the day it stops, the toilet becomes an unventilated chamber in your bathroom.
2. The fan. Small, cheap, and the only powered component. It also pulls air down through the pedestal, which is why a working unit smells of nothing at the seat.
3. The solids chamber. Where carbon bulking material and time do the work. Capacity here decides how often you empty it, not how many people use it.
4. The urine diversion. Most of the volume, and almost all of the odour when it is mixed with solids. Where it goes is the regulator’s real question.
5. The secondary chamber, on continuous-composting units, where material matures while the first chamber fills.
6. The end product, and the reason a council cares: what leaves the unit, and whether the site can legally receive it.

Living with one

The urine bottle is the clock. Five to eight litres is typical — 8.5 on a Nature’s Head, 9 on an OGO Origin — and it wants emptying every one to two days, three at a stretch. Nobody who owns one describes this as pleasant, and everybody describes it as fine.

Solids are the part that scales with the unit. A Nature’s Head takes 60 to 80 uses; for two people full-time, sources put that at three weeks in one manual and up to six in another, and the honest answer is that it depends entirely on how much cover material you add and whether the fan is doing its job. An OGO Origin runs three to four weeks for two, the Cuddy two to three, and the OGO Nomad — the $455 one — five to eight uses, which tells you exactly what it is for. Fixed systems change the arithmetic completely: a Clivus CMHP has two 120-litre chambers for up to three people, and a Sun-Mar Centrex 3000 serving six or seven people normally has its compost removed once a year.

The most interesting design answer to the emptying problem is fifteen years old and Australian:

The same thread has him rotating his once every four months, “making it 2 years”, and explaining that a household could buy extra compartments and store them outside if the contents were still too fresh. He had looked at a Clivus and passed on it because other owners reported pulling out unfinished material at the bottom. Six chambers on a four-month cycle buy two years of composting before anything comes round again — the same problem the caravan brands solve with a spare bucket, at a different scale. And Rota-Loo is on the register.

Why they smell, when they smell

A composting toilet that smells has gone anaerobic, and the causes are a short list: too little cover material, a pile that is too wet, urine finding its way into the solids bin, too much toilet paper, a blocked vent pipe, or a fan that has stopped. Flies — fungus gnats and vinegar flies — arrive when the fan has been off long enough for them to walk in through the exit vent, which is why owners who switch the unit off between trips come back to a problem.

So the fan is not an accessory. Every one of these units runs a 12-volt extractor that holds the bowl at negative pressure, and the draw is small: a Nature’s Head fan uses about 1.68 amp-hours a day, an Air Head around 1.92, a Clivus CMHP fan is 5 watts, a Rota-Loo’s 3 watts. The outlier is the Sun-Mar Centrex 3000, with a 30-watt turbo fan and a 370-watt heater — a number that belongs in your solar sizing, not a footnote.

The half of the problem the toilet doesn’t solve

Take the toilet out of the wastewater and you still have wastewater. The kitchen, the shower and the laundry keep producing greywater, and every state treats that as a system requiring approval in its own right. Somerset Regional Council in Queensland requires a separate greywater septic tank before any land application. WA Health requires a sedimentation tank of at least 1,800 litres treating kitchen, bathroom and laundry, discharged through approved leach drains. EPA Victoria simply mandates that a dry toilet be paired with a greywater treatment plant.

And greywater brings setbacks. EPA Victoria’s land application distances run to 300 metres from a dam, lake or reservoir used for drinking water, 100 metres from a waterway used for drinking water, 50 metres from an open stormwater drain at the strictest level, 15 metres from an in-ground water tank, six from a closed stormwater drain, and six from a children’s grassed playground or an in-ground pool. Those numbers shrink as the treatment level rises, which is the point: better treatment buys you closer siting.

If your block cannot fit a greywater field, a composting toilet does not rescue it. Work out what your site supports first with the which system calculator, size the alternative with the tank size calculator, and see what a septic system costs for what you are comparing against. If you already run a septic tank and are only trying to reduce load, the pump-out guide explains what the tank is actually doing with the solids you would be diverting.

A composting toilet removes the blackwater, not the greywater — the shower and the laundry still need somewhere to go, which is a trench or a greywater system. Check what your council will accept in council approval. The nearest alternative that treats both streams is the worm farm; the conventional one is a septic tank. And if a tank already exists and is failing, compare against replacement cost.