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Meth contamination is a real problem

Contamination from smoking is far more common than from labs, and it can cost an owner tens of thousands. Here is what it means and what to do next.

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Short answer

Meth contamination means methamphetamine residue on a property's surfaces above the Australian residential guideline of 0.5 µg/100 cm². It usually comes from people smoking the drug indoors, less often from manufacture. It can affect occupants' health, the property's value and the owner's legal and insurance position, and it needs a detailed assessment and remediation to fix.

Most common cause
Smoking indoors
Guideline
0.5 µg/100 cm²
Typical remediation
$10,000 to $100,000+
Fix
Remediate, then validate

What to do if your property tests positive

  1. Don't panic or start scrubbing. DIY cleaning can spread residue and destroy evidence for a claim.
  2. Get the detail. If you had a screening or kit result, book a detailed assessment to find which rooms and surfaces are affected.
  3. Limit exposure. Keep children, pregnant people and pets out of affected rooms until you know more.
  4. Call your insurer early. Ask what the policy covers and what evidence they need.
  5. Engage a remediator. Give them the detailed report so the scope matches the problem.
  6. Validate. Book validation testing after the work and keep the report for future sales or tenancies.

Contamination and property value

Undisclosed contamination can lead to cancelled contracts, tribunal claims and higher insurance excesses. Remediation costs commonly run from around $10,000 to well over $100,000 for former labs. A clear test report, or a validation report after remediation, removes that uncertainty and protects value.

Meth contamination in living environments

Meth Contamination In Living Environments Can Be A Health Hazard

Meth contamination in homes is becoming a major issue. Australia has one of the highest rates of methamphetamine use per capita in the English-speaking world, and that number is now three times higher than it was in 2011. In NSW, the number of meth labs has doubled over the past six years.

You may not realise it, but the biggest threat to rental properties is not meth labs, it’s meth users. Smoking meth inside regularly can contaminate a home and regular smoking of the drug can return meth contamination readings as high as those produced by a meth lab.

The detrimental effects of meth contamination

Legal Issues

As a property owner or manager, you are ultimately responsible for ensuring a property is safe for habitation . Australian laws (EPA and local government) say that meth contamination above 0.5 micrograms in a space 100cm square (0.5µg/100cm²) is not acceptable. Landlords face law suits from tenants moving into an already-contaminated property, and adjoining neighbours may also seek legal advice.

Financial Issues

Meth contamination levels greater than 0.5µg/100cm² require a property to be remediated. Meth decontamination can require treating or ripping out carpet, curtains, wall linings, ceilings, electrical wiring, air conditioners, heating and insulation. Insurance cover is available, but it usually sets a cover limit (i.e. $30,000) and requires a substantial excess payment.

Discovering meth contamination as early as possible makes remediation less expensive. It also means meth-using tenants can be evicted before contamination levels increase any further.

Health Issues

While meth residue is odourless and invisible, exposure can cause a wide range of health problems for the property's occupants, including:

  • Respiratory problems to especially for those suffering from asthma
  • Headaches
  • Behaviour problems in young children
  • Sleep pattern changes in children
  • Increased susceptibility to illness
  • Eye and skin irritation

Last reviewed October 2026 by the EnviroForce team

Common questions

Straight answers to the questions people ask us, and ask AI assistants, most often.

Can meth residue make you sick?

Exposure to meth residue has been associated with headaches, sore eyes, skin irritation, breathing problems and sleep and behaviour changes in children, who are most exposed because they touch surfaces and put their hands in their mouths. The risk rises with the level of contamination. If you are worried about symptoms, see your GP and mention the possible exposure.

What level of meth residue is considered unsafe in a house in Australia?

Australia uses a health investigation level of 0.5 µg/100 cm² for residential surfaces, set by the Australian Clandestine Drug Laboratory Remediation Guidelines (2011). A result above that level means the property should have a detailed assessment and, usually, professional remediation before people live in it. Some commercial settings have a higher investigation level. See our guide to safe meth levels.

How long does meth residue stay in a house?

Meth residue does not simply wear off. It is absorbed into paint, plasterboard, carpet, curtains and ducting and can remain detectable for years if the property is not properly remediated. Ordinary cleaning and repainting can mask it without removing it.

Do you clean or remediate meth-contaminated properties?

No. We only sample and test, which keeps our results independent. If remediation is needed, your report gives the remediator a clear map of what to treat, and we can carry out validation testing afterwards to confirm the property is below the guideline.

Does home or landlord insurance cover meth contamination?

It depends entirely on the policy. Some landlord policies cover contamination caused by tenants up to a limit, some exclude it, and most require proof of when contamination happened. That is why insurers ask for an accredited report and why testing at the start of each tenancy matters. How testing supports a claim.

Do I have to disclose meth contamination when selling or renting?

Rules differ by state. In NSW, landlords must tell prospective tenants if they know the property was used to make or grow prohibited drugs in the last two years. Victorian rental providers must disclose known drug trafficking or cultivation in the last five years. Agents everywhere must not mislead buyers or tenants. Read meth laws by state and get legal advice for your situation.

Can I live in a house with low-level meth contamination?

If results are below 0.5 µg/100 cm², the property is considered acceptable for residential use. Above that, the guideline recommends assessment and remediation before occupation, particularly where children live.

Related services and guides

Clearance

Validation testing after remediation

Independent detailed sampling after remediation to prove a property is safe to re-occupy.

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Meth contamination and insurance

What insurers look for and how testing supports a claim.

Read moreGuide

What is a safe level of meth residue?

What 0.5 µg/100 cm² means and what to do above it.

Read moreGuide

Signs of a meth house

Warning signs of meth use or manufacture, and why testing is the only sure answer.

Read moreMeth testing

Meth testing, 24 hours a day

Professional meth residue sampling for sales, purchases, tenancies and insurance, booked 24/7.

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Book NATA accredited sampling.

Book online or call 1300 373 785. Technicians in every state and territory, with urgent bookings taken 24/7.

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