Methamphetamine contamination in residential and commercial properties is more common than most property owners expect — and the consequences of missing it can be severe. This tool is designed to give Queensland landlords, property managers, facility managers, and prospective buyers a rapid, structured way to think through the contamination risk profile of a specific property.
It is not a substitute for NATA-accredited professional testing. But it can help you understand whether urgent action is warranted and provide a useful framework before engaging a qualified occupational hygienist.
How to Use This Tool
Answer each question honestly based on what you know — or don’t know — about the property. Where you are uncertain, choose the option that reflects that uncertainty: in contamination risk assessment, unknown history is itself a risk factor. The tool takes less than two minutes.
Your Meth Contamination Risk Assessment
Meth Contamination Risk Assessment Tool
Answer 8 questions to get an indicative contamination risk rating for your property. Takes less than 2 minutes.
How to Interpret Your Result
The risk rating produced by this tool is based on a weighted score across eight contamination risk factors drawn from occupational hygiene best practice and the Australian Voluntary Code of Practice 2019 (Environmental Health Australia).
Low Risk
A low-risk result indicates no urgent red flags from your responses. However, it does not mean contamination is absent — it means the risk factors commonly associated with elevated contamination are not present. Routine professional testing at tenancy changeover remains best practice even for low-risk properties, and NATA-accredited clearance documentation provides important protection in any future dispute.
Moderate Risk
A moderate-risk result means several risk indicators are present. Professional NATA-accredited meth testing is recommended before re-letting or within the next three to six months. A qualified occupational hygienist can design an appropriate sampling strategy and interpret results in the context of the property’s use history.
High Risk
A high-risk result means multiple contamination risk factors are present simultaneously. Professional testing is strongly recommended before the property changes hands or is re-occupied. Under Queensland’s RTRA Act, a landlord who proceeds without investigating when risk indicators are present faces significant QCAT exposure if contamination is subsequently discovered.
See our guide on QLD landlord obligations under the RTRA Act for what the law actually requires in these circumstances.
Very High Risk
A very high-risk result is a serious indicator. The combination of factors you have described — particularly any combination of confirmed drug activity, physical signs, and no recent testing — warrants immediate professional attention. Do not re-let or allow occupation of the property without NATA-accredited testing conducted by a qualified occupational hygienist. If contamination is found above 0.5 μg/100 cm² (the national health investigation level), professional remediation and a certified clearance test are required before the property is fit for habitation.
What Professional Testing Involves
NATA-accredited meth testing is not a DIY process. It requires a qualified occupational hygienist to attend the property, collect wipe samples (typically one per 10 sqm of floor area, with additional samples in high-risk areas such as kitchens and bathrooms), and submit them to a NATA-accredited laboratory for LC-MS/MS analysis following NIOSH 9111 protocols.
For a typical three-bedroom residential property, this involves 15–20 swabs and costs approximately $3,700–$4,200 in total — covering the hygienist site visit ($1,500), NATA-accredited laboratory analysis ($1,400–$1,900 depending on swab count), and a written hygiene assessment report (~$800). Costs scale with property size and sample count.
See our full guide to meth testing in Queensland for a complete explanation of the testing process, what results mean, and what happens if contamination is found above investigation levels.
Manufacturing vs. Use: Why It Matters
Not all contamination is equal. Properties where meth was manufactured — clandestine lab (clan lab) sites — carry contamination levels and distribution patterns substantially more severe than use-only properties. If your risk assessment indicates a high probability of manufacturing activity, source determination testing is essential: it uses chemical marker ratios to distinguish manufacturing residue from use residue, which affects both the remediation scope and any insurance or legal proceedings.
Our guide on meth source determination covers this in detail — including how the analysis works and what the results mean for the property.
Next Steps After Your Assessment
- Low risk: Consider scheduling routine end-of-tenancy testing as standard practice. Use our provider selection guide to identify a qualified occupational hygienist in Queensland.
- Moderate risk: Arrange professional NATA-accredited testing before the next occupancy. Request a hygiene assessment report with full sample results.
- High risk: Do not re-let until testing results are known. Brief your property manager or solicitor on the RTRA Act obligations that apply.
- Very high risk: Treat the property as contaminated until proven otherwise. Engage a qualified occupational hygienist immediately and do not allow occupation in the interim.
Get a Professional Meth Assessment
Occupational Hygiene Australia provides NATA-accredited meth testing across Queensland and beyond, conducted by qualified occupational hygienists with independent standing. Testing results carry full scientific and legal weight for QCAT proceedings, insurance claims, and property transactions.
Contact us to discuss testing for a specific property or a routine testing programme for your rental portfolio.
