Meth contamination is a measurement problem before it is a cleaning problem. There is one number that decides everything, and almost every argument about meth in Australian property comes back to it.
This covers what meth decontamination actually is, the warning signs worth acting on, how testing works and what the 0.5 µg/100cm² limit really means, what the work costs, and where landlords, buyers and sellers stand legally. It also covers where meth clean up ends and forensic and trauma cleaning begin, because they get confused constantly.
Key takeaways
- Meth decontamination is testing, remediation and clearance. Not a deep clean. It ends with a laboratory result, or it did not happen.
- The number is 0.5 micrograms per 100cm². From the Commonwealth Clandestine Drug Laboratory Remediation Guidelines, and it applies whether the meth was manufactured or just smoked.
- Smoking alone regularly breaches it. WA Health puts average smoking residue at 2.7 µg/100cm², more than five times the limit. “It was only used here” does not survive a lab test.
- Costs sit in a wide band. Roughly $200 to $500 for initial testing, $1,500 to $5,000 for a light targeted clean, and past $20,000 for a badly contaminated house.
- DIY kits screen. They do not clear. They miss residue in wall cavities, ceilings and ductwork, and throw false positives off ordinary cleaning products.
- Disclosure duties differ by state, and none of them currently cover contamination from smoking.
- No licence exists for this work in Australia. Accreditation is voluntary, which is exactly why you check credentials before you hire.
What is meth decontamination?
Meth decontamination is the process of testing a property for methamphetamine residue, removing or treating the contaminated materials, and re-testing to prove the surfaces sit below the Australian health guideline of 0.5 µg/100cm².
People search for it as methamphetamine clean up, meth remediation or meth lab clean up. Same job. It covers four things:
1. Assessment and testing
Surface wipe samples collected to a defined method and analysed by an accredited laboratory.
2. Containment and removal
Sealing the affected area, then stripping out porous materials that cannot be cleaned to a pass.
3. Chemical remediation
Treating hard surfaces, ductwork and structural elements with specialist solutions.
4. Clearance testing
A second round of samples and a written clearance report. This is the deliverable with actual value.
Skip step four and you have not decontaminated anything. You have cleaned. Those are different services, and only one of them produces a document you can hand to a buyer, a tenant, an insurer or a council.
How big is the problem in Australia, really?
Bigger every year, and the numbers are not marketing. The Australian Criminal Intelligence Commission’s National Wastewater Drug Monitoring Program, Report 25 estimated 15.7 tonnes of methylamphetamine consumed nationally in the year to August 2025, a record since the program began and a 23% rise on the year before. Meth made up roughly 59% of combined consumption across the four main drug types measured.
That consumption happens somewhere. Mostly in houses and units.
The older lab detection data tells you where the worst of it lands. In 2015-16 the ACIC recorded 575 clandestine laboratory detections nationally, with around two thirds in residential locations, and Queensland carrying 234 of them. The Illicit Drug Data Report has not been updated past 2020-21, so that residential split is the most recent verified figure available. It is a decade old and the industry still works from it.
Worth knowing: the cook houses are the minority of the work. Most jobs we attend are ordinary rentals where somebody smoked in the lounge room for a year. Fewer chemicals, less drama, still a failing lab result.
The warning signs of meth contamination in a home
The short version: chemical smells that do not belong, yellow or brown staining that keeps coming back, and unexplained health symptoms in whoever lives there. Those three cover most cases.
The fuller list, in roughly the order they turn up:
A distinct chemical odour
Described as cat urine, ammonia or rotten eggs. Usually strongest in bathrooms, laundries and behind kitchen cupboards.
Yellow or brown staining on walls and ceilings
Especially above where someone sat, and around light fittings. It comes back after you paint over it.
Unusual rubbish
Empty pseudoephedrine blister packs, plastic tubing, gas canisters, coffee filters, camp stove fuel, glassware.
A fine residue on high surfaces
A whitish or brownish film on the tops of door frames, ceiling fans and picture rails. Contamination settles high because it travels as vapour.
Respiratory issues that clear up when you leave
Coughing, wheezing, a burning throat that settles within an hour of getting out of the house.
Headaches, dizziness, skin irritation and disturbed sleep
In occupants generally, and particularly in children.
Odd ventilation setups
Extraction fans in strange places, taped windows, sealed vents, exhaust ducting run out a bathroom window.
Neighbours who mention the previous tenants
Heavy foot traffic at odd hours, short visits, chemical smells at night. Neighbours notice more than agents do.
An unexplained drop in property value or rent
A discount that does not match the local market is sometimes a known history nobody has written down.
A confirmed positive result
From a screening kit, a building inspector, or a police notification to the registered owner.
Signs 1 to 9 are reasons to test. Only a laboratory result confirms anything. Plenty of houses smell odd and are clean, and plenty of houses that look perfectly ordinary come back at 8 µg/100cm².
The number that decides everything: 0.5 µg/100cm²
Australia’s remediation trigger for methamphetamine on indoor surfaces is 0.5 micrograms per 100 square centimetres. Above that, remediation is indicated. Below it, the property is considered acceptable for occupancy.
The figure comes from the Commonwealth Clandestine Drug Laboratory Remediation Guidelines (2011), which state that “the presence of methylamphetamine on inside surfaces at a level of greater than 0.5 micrograms (µg) per 100cm² is considered unacceptable”. enHealth’s 2017 guidance confirms it as a Health Investigation Level, derived to protect children aged six months to two years. That tells you who the number was built around.
The thresholds that actually get used
| Setting | Methamphetamine investigation level |
|---|---|
| Residential indoor surfaces | 0.5 µg/100cm² |
| Residential roof and ceiling spaces | 10 µg/100cm² |
| Commercial and industrial premises | 10 µg/100cm² |
| New Zealand residential (for comparison) | 1.5 µg/100cm² |
Source: Australian Voluntary Code of Practice, Environmental Health Australia (2019).
Smoking versus manufacture, and why the distinction matters less than people hope
The WA Department of Health’s 2026 testing and remediation guide is the most useful document in the country on this, because it puts figures against both scenarios.
| Source of residue | Typical surface levels | Against the 0.5 limit |
|---|---|---|
| Smoking (use only) | Average around 2.7 µg/100cm², occasional single readings to 30 | Usually fails |
| Manufacture | Frequently 10 to 100 µg/100cm² or more | Fails heavily |
And critically, from the same document: “The National Guidelines HIL for meth of 0.5 µg/100cm² apply regardless of whether residues found are from smoking or manufacture.”
Read that average again. 2.7 is more than five times the limit. So the common reassurance, that it was only smoked and is therefore fine, fails on the arithmetic in most cases.
The honest counterpoint
We are not going to pretend there is no debate. The Alcohol and Drug Foundation’s methamphetamine exposure and remediation factsheet states plainly that for properties where meth has only been used recreationally, “there are no published (or robust, unpublished) data relating to health risks”, and that remediation in those cases “is not required, as the research does not demonstrate a health risk”.
That is the peak Australian drug information body, and it deserves to be on this page rather than buried.
So where does that leave a property owner? Somewhere practical. The health evidence for use-only contamination is genuinely thin. The regulatory and commercial consequences are not. A result over 0.5 still shows up in a pre-purchase report, still gives a buyer leverage, still sits behind a council public health order, and still ends a tenancy. You may be remediating a compliance and disclosure problem more than a medical one. That is a legitimate reason to remediate, and a more honest one than scaring people.
Health effects of meth residue exposure
Acute effects reported by enHealth include skin, eye and respiratory irritation, dizziness, headache and insomnia. Longer exposure has been associated with neurochemical changes in areas of the brain linked to learning, and with irritability, mood swings and sleep disruption.
Children in former clan lab properties commonly present with respiratory issues and behavioural changes, along with skin rashes, sore and watering eyes, headaches and disturbed sleep.
The best documented Australian case is a Victorian family studied by Wright, Kenneally, Edwards and Walker, published in the US CDC’s MMWR in January 2017. Surface methamphetamine in that house measured 11.7 to 26.0 µg/100cm², roughly 23 to 52 times the guideline. The seven year old had the worst of it: asthma-like symptoms, trouble sleeping, behavioural changes. Hair testing found methamphetamine in every family member, highest in the two youngest children. Symptoms largely resolved in the twelve months after they moved out.
One family is not an evidence base. It is, however, the clearest picture Australia has of what a heavily contaminated home does to the people in it, and the pattern of children being worst affected shows up consistently.
Meth testing in Australia: how it actually works
Meth testing in Australia is the collection of surface wipe samples from defined areas of a property, analysed by an accredited laboratory, with results reported in micrograms per 100cm². Everything else is screening.
Meth testing services fall into three levels, and the level you need depends entirely on why you are asking. A meth swab before an auction is a different exercise to a full clearance assessment after a police raid.
The three levels of testing
| Test type | What it is | When to use it | Turnaround |
|---|---|---|---|
| Screening test | Instant colour-change swab, on-site result | A quick check before a purchase, between tenancies, or to decide whether to escalate | Minutes |
| Composite laboratory test | Several surfaces sampled together, one lab result | Confirming cost-effectively whether a property is contaminated at all | 2 to 5 business days |
| Detailed forensic assessment | Multiple discrete samples, room by room, mapped | Establishing extent and distribution before remediation, and clearance afterwards | 3 to 7 business days |
How a professional sample is taken
Samples are collected on a wipe over a measured 100cm² template following NIOSH Method 9111, then analysed by liquid chromatography or gas chromatography mass spectrometry (GC-MS). The Environmental Health Australia code is direct about the laboratory: “Analysis must only be undertaken by a laboratory that is independently accredited for the analysis of methamphetamine”, meaning NATA accreditation to ISO/IEC 17025 covering the relevant method.
If a testing company cannot name the laboratory and its accreditation, you do not have a defensible result. Credible meth testing Australia wide runs through the same two documents: NIOSH 9111 for sampling, a NATA-accredited lab for analysis.
Where the samples go
High contact and high deposition surfaces carry the story: light switches, door frames, the tops of cupboards, kitchen benchtops, bathroom walls, the return air grille of the air conditioning, and inside range hoods. Sampling only the middle of a wall is how contaminated properties get cleared.
DIY meth test kits versus professional testing
| DIY meth testing kit | Professional meth testing | |
|---|---|---|
| Cost | $30 to $100 per kit | $200 to $500 for an initial set of samples |
| Result type | Presence or absence, colour scale | Quantified µg/100cm² against the national guideline |
| Detects hidden contamination | No. Surface only | Yes. Includes ductwork, cavities and roof spaces |
| False positives | Common. Triggered by some cleaning products | Rare. Lab-confirmed by GC-MS |
| Accepted for insurance or legal use | No | Yes, with a written report |
| Can issue a clearance certificate | No | Yes |
| Good for | A cheap first look before you spend real money | Anything with money, tenancy or liability attached |
Straight answer: buy a kit if you want to know whether to worry. Book a professional test if the answer to that is yes. A kit is a smoke alarm, not a fire report.
The meth decontamination process, step by step
This is the sequence we run. Volumes and dwell times change with the result. The sequence does not.
Assessment and initial testing
Discrete samples across the property, mapped by room and surface. The report gives contamination levels and their distribution, which is what determines scope. No test, no scope, no fixed price.
Site preparation and containment
Plastic sheeting and tape seal the contaminated zone, including vents, doorways and windows. Negative air pressure and HEPA filtered air scrubbers stop particulate migrating into clean parts of the building. In a unit block, this is the step that stops one apartment becoming twelve.
Removal of contaminated materials
Porous materials absorb residue and generally cannot be cleaned to a pass. Carpets, underlay, curtains, upholstered furniture, unsealed timber and, on high level jobs, plasterboard and cabinetry come out. Everything removed is handled as regulated waste, transported to an approved facility, and documented.
Chemical remediation of hard surfaces
Specialised solutions applied by sprayer for even coverage, left to dwell for several hours, then agitated and extracted. Walls, ceilings, floors, frames, cupboard interiors and fixtures. Repeat cycles are normal on higher readings, not a sign something went wrong.
HVAC and ductwork decontamination
Air conditioning is the most commonly skipped part of a meth clean and the most common reason clearance fails. Ducts are cleaned with the same chemistry, filters are replaced rather than cleaned, and the system is tested after.
Sealing and encapsulation where required
Where plasterboard reads high but replacement is not proportionate, a specialist sealing coating locks residual contamination in. This is a judgement call, and it should be documented, not assumed.
Clearance testing and validation
Fresh samples, same method as the initial assessment, same accredited laboratory. Below 0.5 µg/100cm² and the property clears. Above and you clean again and retest. A failed first clearance is not unusual on severe jobs, and you should be told that upfront rather than invoiced for it as a surprise.
Restoration
Replace what came out. Re-line, repaint, re-carpet, reinstate cabinetry, deodorise. The property goes back to pre-loss condition, not to a shell.
Documentation
Sampling plan, laboratory reports, photographs, waste dockets, scope of works, clearance certificate. This is the deliverable with commercial value. Keep it.
Timeframes: a small unit with low level contamination is often a few days. A four bedroom house with widespread residue and material replacement runs one to three weeks. Occupants vacate for the duration.
For a worked example with real hours behind it, see our 12 unit apartment block meth decontamination case study, which ran to more than 700 hours across the building.
What meth decontamination costs in Australia
Expect roughly $200 to $500 for initial testing, $1,500 to $5,000 for targeted cleaning of a smaller, lightly contaminated property, and $10,000 to $20,000 or more where contamination is widespread and materials have to be replaced.
| Stage | Typical cost |
|---|---|
| Meth testing cost (initial, basic set of samples) | $200 to $500 |
| Clearance testing | $200 to $500 |
| Targeted cleaning, low level contamination, smaller property | $1,500 to $5,000 |
| Moderate contamination, multiple rooms, some material replacement | $5,000 to $10,000 |
| Comprehensive decontamination, large or severely contaminated property | $10,000 to $20,000 or more |
| Vehicle meth decontamination | From around $500 |
These are indicative. A real number comes after a real test.
The eight things that move the price
1. Severity
Low level surface residue versus a former production site. Manufacture contamination is often 20 to 200 times higher and behaves completely differently.
2. Property size and layout
A single level two bedroom unit is faster and cheaper than a four bedroom, two storey home. More surfaces, more samples, more labour.
3. Testing requirements
Every test is laboratory fees plus professional time. A failed clearance means another clean and another test.
4. Materials affected
Tiles, glass and stainless steel clean easily. Carpet, curtains, upholstery and unsealed timber usually get removed and replaced instead.
5. Access and safety
Remote locations, limited entry points, upper floors, temporary fencing, extra ventilation plant.
6. Waste disposal
Contaminated porous material is regulated waste. Approved facilities charge by weight or volume and that cost passes through.
7. Urgency
Work that must land before a settlement date or a new tenancy means more crew or out of hours labour.
8. Location
Metro labour rates are higher but availability is better. Regional and remote work carries travel and freight.
For a city-specific breakdown, our guide to meth decontamination cost in Sydney works through a real quote line by line.
How to prepare your property for meth removal
Six things, in order, before the crew arrives.
- Stop occupying it. Nobody should live in a property that has returned a significantly elevated result while it is being remediated.
- Do not clean it yourself. Well meant scrubbing spreads residue, damages surfaces, and can compromise the sampling that decides your scope.
- Photograph everything. Rooms, staining, damaged materials, contents, before anyone touches anything. This is what supports an insurance claim, a bond dispute or a claim against a former tenant.
- Notify who needs to know. Your insurer, your property manager, and if a public health order has been issued, your local council. Tenants must be told in writing, with dates.
- Remove what you want to keep, carefully. Hard, non-porous personal items can often be cleaned. Soft furnishings, mattresses and clothing frequently cannot. Ask before you move anything into a clean space.
- Get the scope in writing before work starts. Sampling plan, what gets removed, what gets treated, whether clearance testing is included, and who pays if the first clearance fails.
Meth contamination and the law: landlords, tenants, buyers and sellers
There is no single Australian meth law. There is a national guideline, state public health legislation, and separate tenancy and property rules. Here is the honest map.
| Jurisdiction | What actually applies |
|---|---|
| National | Clandestine Drug Laboratory Remediation Guidelines (2011) and enHealth guidance (2017). Recommended, not binding. Enforcement is state and local. |
| Queensland | The strongest statutory hook. A former lab site is a prescribed public health risk under the Public Health Regulation 2018 s 27A, and local councils can issue a public health order under the Public Health Act 2005. See Queensland Health. |
| New South Wales | Managed by councils through land use planning and section 10.7 planning certificates. A landlord must disclose manufacture or cultivation of a prohibited drug in the last two years (NSW Government). The same two year history is a prescribed material fact on sale (misrepresentation rules). |
| Victoria | Councils act through nuisance provisions of the Public Health and Wellbeing Act 2008. Rental providers must disclose trafficking or cultivation in the last five years (Consumer Affairs Victoria). |
| Western Australia | The most current guidance in the country: WA Health’s 2026 guide for testing and remediation companies. |
| South Australia | The only state with a dedicated statutory instrument, the South Australian Public Health (Clandestine Drug Laboratories) Policy 2016. |
Three things worth noticing in that table
First, none of the tenancy disclosure rules cover smoking. NSW covers manufacture and cultivation. Victoria covers trafficking and cultivation. A property where meth was heavily smoked for two years, now reading 4 µg/100cm², triggers no automatic disclosure duty under either. That is a real gap, and it is why pre-purchase and pre-lease testing exists.
Second, in Queensland the cost of complying with a public health order falls on the property owner, and the property is generally vacated until remediation is complete. The Residential Tenancies Authority sets out the tenant’s side, including the ability to issue a Notice of Intention to Leave if the premises are not fit to live in.
Third, nothing here requires a licence to perform meth decontamination. Anyone can print a shirt.
Please note: this is general information about how the rules are structured, not legal advice. Obligations turn on your specific circumstances and your state. Check with your state authority or a solicitor before relying on it.
Landlords, agents and body corporates: what to do when it happens
Do this
- Test before you scope. Nobody can quote a decontamination honestly without a result.
- Check the insurance position early. Policies vary widely and nearly all require prompt notification.
- Manage the tenancy properly. If the premises are not fit to live in, tenants have rights and timeframes.
- Keep the clearance certificate permanently. It protects you at the next lease, the next sale and the next dispute.
- Test between tenancies on higher risk portfolios. A $300 screening test at turnover is cheap against a $12,000 remediation found eighteen months late.
Do not do this
- Do not enter and start cleaning. If police have attended, the notification to the registered owner is the start of your paper trail.
- Do not send your regular commercial cleaner. Different training, different chemistry, different waste stream.
- Do not accept a fixed price given over the phone before any testing. It is a guess or it is padded.
- Do not assume insurance covers it, or assume it does not. Read the policy wording.
- Do not repaint over staining to get a property re-let. It hides nothing a swab will not find.
Meth clean up, forensic cleaning and trauma cleaning: what is the difference?
They overlap, they are not the same, and the difference matters when you are booking one.
| Meth decontamination | Forensic and trauma cleaning | Regular commercial cleaning | |
|---|---|---|---|
| What it removes | Chemical residue from methamphetamine use or manufacture | Blood, bodily fluids, tissue and other potentially infectious material | Dust, soil, general grime |
| Triggered by | Clan lab, heavy use, failed pre-purchase test, public health order | Crime scenes, suicides, unattended deaths, industrial accidents, hoarding and squalor | Routine maintenance |
| Verified by | Laboratory clearance testing against 0.5 µg/100cm² | Visual and process verification, ATP or UV confirmation | Nothing formal |
| Standard or framework | Commonwealth guidelines, enHealth, EHA voluntary code | ANSI/IICRC S540 Standard for Trauma and Crime Scene Cleanup | None |
| Waste stream | Regulated hazardous waste | Clinical and biohazard waste | General waste |
| Certification | IICRC-certified restoration technicians, accredited laboratory partner | IICRC Trauma and Crime Scene Technician (TCST) | Not applicable |
A note on standards, since a lot of Australian marketing gets this wrong: the IICRC does not publish a methamphetamine standard. ANSI/IICRC S540, now in its second edition (2023), covers trauma and crime scene cleanup, and its scope is blood and other potentially infectious materials rather than chemical drug residue. Meth work in Australia sits under the Commonwealth guidelines and the Environmental Health Australia voluntary code. Anyone telling you S540 governs their meth clean has not read it.
What forensic cleaners actually do
Our forensic cleaning team attends crime scenes, suicides, unattended deaths, industrial and vehicle fatalities, assaults in public areas, sharps and needle recovery, correctional facilities, and hoarding and squalor. The sequence, in short: assess, contain, remove biological matter, clean and disinfect with hospital grade product, deodorise, restore, verify, document.
Unattended deaths are their own category. Work starts only after the body has been removed and the scene released by police or the coroner. Decomposition drives fluid into subfloor, wall cavity and framing far beyond the visible stain, which is why an unattended death job is usually a structural job, not a surface one.
The equipment
The kit that separates biohazard decontamination from cleaning:
Full PPE
Personal protective equipment: gloves, respirators, goggles, disposable coveralls and boot covers.
Biohazard waste containers
Labelled, leak-proof and compliant with regulated waste requirements.
HEPA vacuums
For particulate that ordinary vacuums simply recirculate back into the room.
Hospital grade disinfectants
And, for meth, specialist chemical remediation solutions rather than off-the-shelf product.
Negative air machines and air scrubbers
To hold containment and stop cross-contamination into clean areas.
UV inspection lights
To find bodily fluid that is invisible under normal light.
Hydroxyl generators
Break down odour and airborne contaminants. They penetrate fabrics rather than sitting on top of them.
Ozone generators
For sealed, unoccupied spaces where hydroxyl treatment is not the right tool.
Training, certification and the risks the job carries
Our technicians hold IICRC certification, with forensic specialists completing the Trauma and Crime Scene Technician qualification. Beyond the certificate, the training exists because the risks are concrete: bloodborne pathogen exposure including hepatitis and HIV, sharps and broken glass, chemical exposure from the remediation products themselves, unstable structures, and the psychological load of the work. Crews that do this properly run debriefs and have access to support. Crews that do not, burn out or cut corners.
There is also an evidence issue. Do not clean a scene before police release it. You can destroy evidence and expose yourself to liability. Call the authorities first, then the cleaners. Always in that order.
The other jobs on the same call sheet
Meth is rarely the only thing wrong with a property that has been through a rough tenancy. Three related problems that turn up on the same site visits, plus vehicles.
Mould
Sealed up houses, disconnected exhaust fans, untreated leaks. Commercial options include chemical treatment, dry ice blasting and high pressure water cleaning on hard surfaces, never on plasterboard or unsealed timber. Method gets chosen after inspection. Mould removal and remediation.
Smoke damage and soot
Wet smoke from plastics leaves thick smeary deposits, dry smoke from timber leaves powder, protein smoke is nearly invisible but yellows paint. Soot is acidic and starts corroding immediately, so speed beats technique. Fire damage restoration.
Odour
Nicotine, decomposition, smoke, animal waste. Masking agents fail because the source is still sitting in the substrate. Odour removal.
Vehicles
A car is a sealed box lined with fabric, so residue concentrates and porous trim holds it. Different process, usually lower cost than people expect. Vehicle decontamination and meth cleaning in vehicles.
How to choose a meth decontamination company in Australia
Because the work is unlicensed, the burden of vetting sits with you. Six questions that sort it out fast.
Which NATA-accredited laboratory do you use, and is methamphetamine in their scope?
A specific answer, or walk.
Do you follow the Commonwealth guidelines and the EHA voluntary code?
Ask which sampling method. The answer should be NIOSH 9111.
Is clearance testing included, and who pays if the first clearance fails?
Get it in writing before work starts.
Is the person testing the same person remediating?
Some owners prefer independent testing to remove the conflict. It is a fair thing to ask about and a fair thing to arrange.
What certifications do the technicians hold?
IICRC certification is the baseline in Australian restoration.
What documentation do I receive at the end?
If the answer does not include a clearance report with laboratory results, you are buying a clean, not a decontamination.
AllAces has been doing restoration work in Australia for more than 35 years, across more than 65,000 jobs, with IICRC-certified technicians and 24/7 response from branches in Brisbane, Sydney, Melbourne and Ballarat. Our meth decontamination service covers testing, remediation and clearance reporting, and we handle the insurer correspondence where a claim is involved. You can see our industry accreditations here.
Frequently asked questions
What is the safe level of meth residue in an Australian property?
0.5 micrograms per 100cm² on indoor residential surfaces. Above that, remediation is indicated under the national Clandestine Drug Laboratory Remediation Guidelines. Roof spaces and commercial premises use a higher level of 10 µg/100cm².
Can I clean up meth contamination myself?
No, and it is a bad idea for three reasons. Household cleaning does not remove residue from porous materials, it spreads contamination into clean areas, and it produces no clearance result, which is the only thing with legal or commercial value. Contaminated materials are also regulated waste and cannot go in a skip.
How long does meth decontamination take?
A small unit with low level contamination is often a few days. A larger or heavily contaminated house runs one to three weeks including material replacement, restoration and clearance testing. Laboratory turnaround adds two to five business days at each testing stage.
Are DIY meth testing kits accurate?
They are useful screening tools and unreliable as evidence. They detect surface residue only, miss contamination inside wall cavities, ceilings and air conditioning, and can return false positives from some cleaning products. A positive kit result should always be confirmed by laboratory testing.
Does insurance cover meth decontamination?
Sometimes. Some landlord and home policies respond to contamination or malicious damage by tenants, many specifically exclude illicit drug contamination, and nearly all require prompt notification and documented evidence. Check your policy wording before you commit to a scope of works.
How long does meth residue stay in a house?
Indefinitely if it is not remediated. Methamphetamine residue is stable, does not break down on its own, and has been detected in properties years after the activity stopped. Painting over it does not remove it.
Do I have to tell a buyer or tenant that a property was contaminated?
It depends on the state and on what happened. In New South Wales, manufacture or cultivation in the last two years must be disclosed to tenants and is a prescribed material fact on sale. In Victoria, trafficking or cultivation in the last five years must be disclosed to renters. Neither rule captures smoking. Get advice on your specific situation.
Is meth residue dangerous to children and pets?
Children are the group the 0.5 µg/100cm² guideline was designed to protect, specifically infants aged six months to two years, because they crawl, put hands in mouths and breathe closer to the floor. Reported effects in contaminated homes include respiratory symptoms, skin rashes, disturbed sleep and behavioural changes. Pets show similar respiratory and skin problems.
The bottom line
Meth contamination is a measurement problem before it is a cleaning problem. Test first, because a result determines the scope, the price and whether there is anything to fix at all. Then remediate to the 0.5 µg/100cm² guideline with an accredited laboratory verifying the outcome, and keep the clearance report.
Be sceptical of anyone quoting a price before testing, anyone claiming a licence that does not exist in this country, and anyone telling you smoking contamination is automatically harmless. The evidence on health risk from use-only contamination is genuinely unsettled. The evidence on what a failed result does to a sale, a tenancy or a council order is not.
Dealing with a suspected contamination right now? AllAces provides meth testing, decontamination and clearance reporting across Brisbane, Sydney, Melbourne and Ballarat, 24/7. Call 1800 00 10 10, or get in touch here.
Spotted the signs in a car rather than a house? Residue behaves differently in a vehicle and so does the clean: meth contamination in a vehicle. Managing a tenanted or commercial site? Start with a professional meth test and decontamination rather than a domestic clean.
Confirmed contamination needs certified remediation and a clearance report. Call AllAces on 1800 00 10 10.
This guide is reviewed every six months. Last updated August 2026 with current ACIC consumption data, the 2026 WA Health remediation guidance, and revised state disclosure rules.
The rest of this guide
Detailed companion articles on each stage, for when you need more than the summary.
- Meth testing danger levels: what a reading actually means against the 0.5 µg/100cm² guideline.
- The meth testing process: the three test types, sampling and lab turnaround.
- Preparing a property for meth removal: what to do, and not do, before the crew arrives.
- The meth decontamination process: every stage from containment to clearance.
- What moves the price: the eight factors behind a decontamination quote.
- Meth decontamination cost in Sydney: a real quote, worked through line by line.
- Meth cleaning in vehicles: why a car is a different job to a house.
- Case study: a 12 unit apartment block: 700+ hours, with the real numbers.
Dealing with biological contamination rather than chemical residue? That is a separate discipline with its own process and standard: forensic and trauma cleaning in Australia.
