The meth contamination rules in New Zealand changed on 16 April 2026, giving landlords clearer requirements for testing, decontamination and managing rental properties affected by methamphetamine. If you own a rental property and contamination is suspected or confirmed, knowing what to do next is important.
The new Residential Tenancies (Managing Methamphetamine Contamination) Regulations 2026 set a maximum acceptable methamphetamine level of 15 µg/100 cm². They also set a maximum inhabitable level of 30 µg/100 cm² for rental premises.
For landlords, the key point is simple: a positive screening result is not the end of the process. You need to understand when detailed testing is required, when decontamination must happen, what information tenants must receive and when the property can be considered ready again.
What Are the New Meth Contamination Rules in NZ?
The new meth contamination rules came into force on 16 April 2026.
They establish:
- A maximum acceptable methamphetamine level of 15 µg/100 cm²
- A maximum inhabitable level of 30 µg/100 cm²
- Circumstances where landlords must arrange detailed testing
- Requirements for decontaminating contaminated areas
- Requirements for post-decontamination testing
- Rules around contaminated premises and tenancy management
- Specific requirements for dealing with some contaminated tenant belongings
The rules apply to residential tenancy premises, so this article is primarily relevant to landlords and property managers managing rental properties.
For the full legislation, landlords can read the official Residential Tenancies (Managing Methamphetamine Contamination) Regulations 2026.
Meth Contamination Rules: What Does 15 µg/100 cm² Mean?
Under the 2026 meth contamination rules, a rental property is considered contaminated when methamphetamine residue is above 15 µg/100 cm² in any part of the property. The affected area must then be decontaminated until the level is 15 µg/100 cm² or below.
Importantly, contamination is considered on an area-by-area basis.
For example, if testing finds:
- Bedroom: 20 µg/100 cm²
- Kitchen: 8 µg/100 cm²
- Living room: 10 µg/100 cm²
the bedroom is above the maximum acceptable level and requires attention. The other areas are below that threshold.
This means a positive result does not automatically mean the entire house needs to be stripped out or rebuilt.
The correct response depends on the testing results, affected areas and materials.
What Happens If Meth Levels Are Above 30 µg/100 cm²?
The meth contamination rules also establish a maximum inhabitable level of 30 µg/100 cm².
If any part of a rental property is tested above this level, the property is considered uninhabitable under the current guidance, subject to the specific rules for remote and inconsequential areas.
In these circumstances, the Residential Tenancies Act provides specific options for ending the tenancy.
For example, where the landlord is not at fault for the contamination, Tenancy Services states that a landlord can give 7 days’ notice to terminate in the circumstances covered by the Act. A tenant who is not at fault can give 2 days’ notice.
Because tenancy termination can have legal consequences, landlords should obtain independent legal advice when necessary rather than relying on a blog article alone.
Meth Contamination Rules: When Must a Landlord Arrange Testing?
One important change is that landlords do not have to automatically arrange meth testing between every tenancy.
However, the 2026 meth contamination rules require landlords to arrange detailed testing when certain circumstances occur.
This includes situations where:
- Police or a local council notifies the landlord that methamphetamine manufacture has, or is likely to have, taken place at the property, or
- A valid screening assessment indicates contamination above the maximum acceptable level and the landlord is notified of the result.
The landlord must arrange the required testing as soon as practicable after receiving the relevant notification.
What Is the Difference Between Screening and Detailed Testing?
A screening assessment can indicate whether further investigation may be required.
Detailed testing goes further. It determines how much methamphetamine contamination is present, where it is located and whether decontamination is required.
Under the current guidance, only qualified professionals can carry out detailed testing, and the people conducting detailed testing must not be the same people carrying out the decontamination work for that property.
This distinction is important when choosing contractors.
What Must Landlords Do After a Positive Meth Test?
If testing confirms contamination above the applicable level, the next step is to address the affected area through the required decontamination process.
A practical sequence is:
Positive result → Detailed testing → Remediation plan → Decontamination → Post-decontamination testing → Reoccupation when requirements are met
The landlord should not simply arrange ordinary house cleaning and assume the contamination has been resolved.
The meth contamination rules require decontamination to follow the process prescribed by the 2026 Regulations, which is based on Section 4 of NZS 8510:2017, with modifications specified by the Regulations.
Meth Decontamination Must Follow the 2026 Rules
Landlords can carry out the required decontamination themselves or engage another person to do the work.
However, if a landlord hires a contractor, the contractor must be independent of:
- The person who carried out the detailed meth testing
- The person who will carry out the post-decontamination testing
- The person who carried out the screening assessment, where applicable
This separation is an important part of the new meth contamination rules.
It helps keep testing, cleaning and verification as separate stages of the process.
For landlords who prefer professional remediation, Kiwi Meth Xpert provides meth decontamination services for contaminated properties.
What Areas and Materials May Need Cleaning?
Meth contamination can affect different surfaces and materials differently.
Depending on the testing results, decontamination may involve areas such as:
- Walls
- Ceilings
- Floors
- Doors
- Cabinets
- Light fittings
- Installed heaters
- Other hard surfaces
- Carpets
- Curtains
- Soft furnishings
The current Tenancy Services guidance gives specific requirements for carpets, curtains and other landlord-provided soft furnishings in contaminated areas. Where these items can be decontaminated, they must be HEPA-filter vacuumed and steam cleaned. Items that cannot be adequately cleaned, such as some couches or mattresses, must be removed and replaced.
For more information about contaminated furnishings, landlords can also read Kiwi Meth Xpert’s guide to meth contaminated furniture cleaning.
Do Tenants Have to Move Out During Meth Decontamination?
Not necessarily.
Tenancy Services states that tenants are not automatically required to move out while decontamination is taking place.
However, landlords and tenants should discuss whether temporary relocation is practical while work is completed. They should also discuss any rent reduction that may apply and record agreements in writing.
Landlords also need to follow the appropriate notice requirements before entering a tenanted property to carry out testing or decontamination.
This is another reason property managers should plan the work carefully instead of treating meth cleaning as ordinary maintenance.
Landlords Must Keep Tenants Informed
The 2026 meth contamination rules also affect communication with tenants.
Where a property is tenanted, landlords have notification and disclosure obligations relating to testing.
Tenancy Services states that landlords must provide existing tenants with test results within 7 days of receiving them.
Failing to follow the required notification and disclosure obligations can expose landlords to penalties.
So, when contamination is suspected, keep a clear record of:
- Test dates
- Testing results
- Notices provided to tenants
- Contractor details
- Cleaning and remediation work
- Invoices
- Photos where appropriate
- Post-decontamination testing
- Communication with the tenant
Good records can also help if a dispute later reaches the Tenancy Tribunal.
When Is Meth Decontamination Actually Complete?
This is one of the most important parts of the new meth contamination rules.
A property is not considered properly decontaminated simply because:
- The walls have been cleaned
- The carpets have been treated
- The property looks fresh
- The cleaning company has finished
- The landlord believes the residue has been removed
The Regulations state that the decontamination process is complete only when post-decontamination testing has been carried out and shows that the premises are no longer contaminated.
If testing still shows contamination above the maximum acceptable level, further decontamination and testing are required.
This creates a clear process:
Test → Clean → Test Again
The final testing stage is therefore an important part of the remediation process.
What About Tenant Belongings Left Behind?
The new rules also address abandoned goods at contaminated premises.
If a tenant leaves belongings behind, landlords need to follow the relevant abandoned-goods process. Tenancy Services notes that landlords should take the additional costs of testing and decontamination into account when determining whether abandoned goods are valuable enough to store.
Some contaminated belongings may also need to be assessed for decontamination or removal.
Do not automatically throw away a tenant’s belongings simply because contamination has been identified. Follow the applicable legal process and seek advice where necessary.
Meth Contamination Rules: What Landlords Should Do Step by Step
If you are a landlord and receive information about possible meth contamination, use this as a practical checklist.
Step 1: Don’t Ignore the Result
If Police, the council or a valid screening assessment indicates a contamination concern, take it seriously.
Step 2: Arrange the Required Detailed Testing
Where the 2026 requirements apply, arrange detailed testing through a qualified professional.
Step 3: Identify the Affected Areas
Use the test results to understand where contamination is above the applicable threshold.
Step 4: Arrange Appropriate Decontamination
Follow the process required under the 2026 Regulations and NZS 8510:2017 as modified by the Regulations.
Step 5: Keep the Tenant Informed
Follow the correct notice, access and information requirements.
Step 6: Complete Post-Decontamination Testing
A qualified professional must carry out detailed post-decontamination testing.
Step 7: Keep Your Records
Keep testing reports, cleaning records, invoices and relevant communications.
Step 8: Only Return to Normal Occupancy When Requirements Are Met
Do not assume the property is ready simply because it looks clean. Follow the testing and remediation requirements that apply to the property.
Common Mistakes Landlords Should Avoid
The new meth contamination rules make it important to avoid a few common mistakes.
Mistake 1: Treating a Positive Screening Result as the Final Result
Screening can indicate that further detailed testing is required. It does not necessarily provide the complete contamination assessment.
Mistake 2: Using Ordinary House Cleaning
Normal cleaning is not automatically the same as professional meth decontamination.
Mistake 3: Using the Same Company for Everything
The regulations include independence requirements between testing, decontamination and post-decontamination testing.
Mistake 4: Forgetting Post-Cleaning Testing
Cleaning is not the final step. Post-decontamination testing is required to establish whether the property is no longer contaminated.
Mistake 5: Not Giving Tenants Their Results
Existing tenants must receive relevant test results within the required timeframe.
Mistake 6: Assuming Every Positive Property Needs Complete Strip-Out
The current guidance considers contamination on an area-by-area basis. The appropriate remediation depends on the affected areas, materials and test results.
Why Professional Meth Decontamination Can Help Landlords
Managing a contaminated rental property involves more than cleaning surfaces.
A professional remediation team can help landlords understand:
- Which areas require attention
- Which surfaces can be cleaned
- Which materials may require replacement
- How the decontamination process should be managed
- What testing is needed after cleaning
- How to document the remediation work
Kiwi Meth Xpert provides professional meth cleaning and decontamination services across New Zealand.
Its service offering includes meth house decontamination, meth commercial cleaning and meth car cleaning, along with meth testing solutions.
Final Thoughts on the 2026 Meth Contamination Rules
The new meth contamination rules give landlords a clearer process for dealing with contaminated rental properties.
The key points are:
15 µg/100 cm² → maximum acceptable level
Above 15 µg/100 cm² → affected area is contaminated and requires decontamination
Above 30 µg/100 cm² → maximum inhabitable level is exceeded, triggering additional tenancy rules
After decontamination → detailed post-decontamination testing is required
For landlords, the safest approach is to test properly, follow the required remediation process, communicate with tenants and verify the property after cleaning.
For the latest legal requirements, always check the official Tenancy Services meth contamination guidance and the 2026 Regulations on New Zealand Legislation.
Need Professional Meth Decontamination?
If your rental property has tested positive for meth contamination, don’t rely on ordinary cleaning or guesswork.
Kiwi Meth Xpert can help with professional meth testing, cleaning and decontamination.
👉 Contact Kiwi Meth Xpert for professional meth decontamination
Get the property assessed, understand the required next steps and arrange professional remediation where needed.
