A Meth Test Result Is More Than a Number.
What your laboratory result does and does not tell you about a rental property.
A laboratory report tells you how much methamphetamine residue was recovered from the sample. On its own it does not tell you where the contamination sits, how the sample was taken, which assessment level you had, or what the result means next to a documented baseline.
EnviroCheck Forensics reviews methamphetamine testing reports and laboratory results for landlords and property managers, helping interpret the findings before you make a call on testing, cleaning, disclosure or the tenancy itself.
Reviewing a report on behalf of an insurer? See the insurance report review service. Need new testing? Rental property meth testing.
What a Number on Its Own Does Not Tell You
A result is one piece of evidence. These are the questions that decide what it means for the property and for your position as the landlord.
Where the contamination was found
Which rooms and surfaces were sampled, and whether the result points to a localised area or a wider spread through the property.
How the sample was taken
Composite screening and room-by-room individual sampling under NZS 8510:2017 are not interchangeable. Each supports a different type of decision.
Which assessment level you had
A Baseline Screening Assessment, an Enhanced Screening Assessment and a Detailed Assessment set different expectations for what the result can support.
How it sits against the threshold
The residential threshold is 15 µg/100 cm². Above that level the 2026 regulations trigger a defined response, but contamination detected below it still carries cost, disclosure and liability implications.
Whether it compares to a baseline
A result carries real meaning next to a documented starting point. Without a pre-tenancy baseline there is nothing to measure change against.
What the next step should be
Further testing, cleaning, disclosure or no action at all. The answer depends on what the report and the sampling record actually support.
Situations We See Most Often
If any of these describe where you are right now, a technical review of the material you already hold is usually the fastest way to get a clear position.
You hold a pre-tenancy baseline and a later result, and you want to know whether the two are actually comparable.
A result has come back above the threshold and you are deciding between further testing, cleaning and disclosure.
You suspect use has resumed and you want to know whether the evidence supports going back to the tenant.
Your insurer, loss adjuster or assessor has asked for a technical interpretation of the findings.
A property manager or previous owner has given you a summary rather than the full laboratory report and sampling record.
You are buying or selling a tenanted property and a report has been passed to you as part of the process.
The Technical Material, Considered Properly
- Laboratory analytical results, reported units and the analytical method used
- Composite versus individual sampling, and what each type of result can support
- Sampling methodology, documentation and record keeping
- Interpretation against NZS 8510:2017 and current residential tenancies requirements
- Contamination distribution, and the limits of what the sampled locations can show
- Comparability against a prior baseline or an earlier result at the same property
- Whether further assessment, cleaning verification or no further action is warranted
Clear Boundaries, Stated Up Front
- A review is not an on-site investigation. It works from the information and evidence you supply.
- A review does not replace a laboratory analysis, or a formal assessment under NZS 8510:2017 where one is required.
- EnviroCheck is an independent testing and advisory service. We do not carry out remediation and do not quote for it.
- We do not make legal, tenancy or insurance coverage decisions. For obligations under the Residential Tenancies Act, take advice from Tenancy Services or your own legal adviser.
Discover EnviroCheck in 15 Seconds
Independent meth sampling, accredited laboratory analysis, property risk intelligence and MethShield® protection — we collect the samples, independent laboratories analyse them.
Have the Result in Front of You? Send It Through.
Attach the laboratory report or sampling documentation you already hold for the rental property. We will review the technical material and come back to you with what it does and does not support.
Common Questions From Landlords
Do I need a review, or should I just get the property retested?
If you already hold a laboratory report and the question is what it means, a review is usually the faster and cheaper step. If the result is unclear, the sampling was composite, or a formal determination is needed, we will tell you that further testing is the right answer instead.
Can a result below the threshold be ignored?
Not automatically. The residential threshold is 15 µg/100 cm², and above that level the 2026 regulations trigger a defined response. Contamination detected below the threshold still carries cost, disclosure and future liability implications, so it is worth understanding before you decide to do nothing.
What if I only have a summary and not the full report?
Send what you have. A review can still be useful, but the conclusions will be limited to the material supplied. Where the full laboratory report and sampling record are needed to answer your question, we will tell you what is missing.
Does a review tell me what I have to disclose to my tenant?
No. A review is a technical review of the evidence, not legal advice. It helps you and your adviser understand what the report does and does not support before you act on it. For obligations under the Residential Tenancies Act, take advice from Tenancy Services or your own legal adviser.
Can EnviroCheck test the property as well?
Yes. We are an independent testing and advisory service, and we do not remediate, so our findings serve you rather than a remediation workstream. We test across New Zealand, including pre-tenancy baselines, end-of-tenancy testing and post-clean verification.
More detail: rental property meth testing, contamination thresholds, how to read a toxicology report and after a positive meth test.