Concerned about suspected methamphetamine contamination in an Invercargill rental? Do not try to identify it by smell or appearance. Follow the current testing rules, use an approved assessment, keep records and arrange qualified help when required. The New Zealand regulations changed on 16 April 2026.
What are the current meth residue limits?
The Residential Tenancies (Managing Methamphetamine Contamination) Regulations 2026 set two important thresholds. A property is contaminated when a prescribed test finds more than 15 micrograms per 100 square centimetres in any part of the premises. If any part is above 30 micrograms per 100 square centimetres, it is above the maximum inhabitable level. The rules assess affected areas room by room; a result in one room does not automatically mean every room has the same reading.
These numbers are legal thresholds, not do-it-yourself testing advice. Testing must use a method allowed under the regulations and New Zealand Standard 8510:2017 as modified by the regulations.
What should an Invercargill landlord do if contamination is suspected?
- Record the concern. Note what was reported, when it was reported and any available evidence. Do not make accusations or promise a result before it has been tested.
- Consider an approved screening assessment. A valid screening assessment can indicate whether more detailed testing is needed. Check that the method and sampling instructions meet the current rules.
- Arrange detailed testing when required. A landlord must arrange detailed testing if Police or the local council advise that methamphetamine has likely been manufactured at the property, or if a valid screening assessment shows contamination and the landlord becomes aware of that result. Only a qualified professional may carry out detailed testing.
- Keep the tenant informed. Give the required notice before entering with a contractor. Where there are existing tenants, provide test results within seven days of receiving them, as required by the law.
- Use a separate qualified professional for clearance testing. The person who performs detailed testing after decontamination must not be the same person who carried out the decontamination work.
When is decontamination required?
Areas tested above the maximum acceptable level of 15 micrograms per 100 square centimetres must be decontaminated in accordance with the current regulations. The rules modify how NZS 8510:2017 applies. They also set specific requirements for some landlord-provided carpets, curtains and soft furnishings: items that can be retained must be HEPA-vacuumed and steam-cleaned, while items that cannot be cleaned must be removed and replaced. Ask a qualified professional to interpret the standard for the property and document the work completed.
After decontamination, a qualified professional must carry out detailed testing again. Further cleaning and testing may be required if readings remain above the acceptable level. Do not treat cleaning alone, an unvalidated kit or a general “clearance” statement as proof that the legal process is complete.
Can a rental remain occupied during the work?
The regulations do not automatically require tenants to move out during decontamination. Landlords and tenants should discuss the affected area, safety, access, timing, possible relocation and any rent reduction. Record any agreement in writing. If test results are above the maximum inhabitable level, specific tenancy termination rules may apply; get advice based on the test report and circumstances before serving notice.
Does every Invercargill rental need a meth test between tenancies?
No. Landlords are not generally required to arrange meth testing between every tenancy. Testing may still be appropriate where there is a reason to believe contamination has occurred, and the landlord must arrange detailed testing in the circumstances specified by the regulations. Avoid routine testing that does not follow a clear, evidence-based purpose.
How Ray White Invercargill can help
For a rental we manage, our local property management team can help organise the next steps, coordinate access and keep the tenancy record together. We cannot determine contamination from an inspection or replace a qualified testing professional, legal adviser, insurer or Tenancy Services. If you are considering professional management, see our Invercargill property management service or request a rental appraisal.
Common questions
Does a result over 15 mean a whole house is uninhabitable?
No. More than 15 micrograms per 100 square centimetres means the affected part is contaminated and must be decontaminated. The separate maximum inhabitable level is more than 30, and the rules consider the part of the premises affected.
Can I use any test kit?
No. Only methods that meet the prescribed requirements can produce a valid screening assessment or detailed test. Check the current Tenancy Services guidance before choosing a method.
Where can I check the official rules?
Read the Tenancy Services guide to meth contamination, its testing and decontamination standards, and the 2026 regulations. These sources govern if a summary differs.
This page is general information for Invercargill rental-property owners, current at publication. It is not legal, health or laboratory advice. Rules and facts may change; confirm the correct steps with Tenancy Services or a qualified professional.