Clarity at Last: What the New Meth Threshold Means for NZ Rental Properties

The recent announcement confirming an increase to acceptable methamphetamine levels in rental properties to 15µg per 100cm² on 16 April 2026 marks a significant and positive shift for the New Zealand property industry.

For years, landlords, property managers, and tenants have operated in an environment of uncertainty. Conflicting guidance, evolving standards, and inconsistent interpretation have made meth testing a complex and, at times, stressful part of property compliance.

This update provides something the industry has been calling for: clarity, consistency, and confidence.

There’s a lot to unpack in the new legislation, here’s the highlights

1. Maximum Acceptable Level increases to 15ug/100cm2 on a single sample
2. If a property exceeds this level it must be decontaminated
3. If a property exceeds 30ug/100cm2 and there is an existing tenancy it can be terminated by the Tenants giving 2 days’ notice or the Landlords giving 7 days’ notice as long as there has been no breach 
4. If a property sits between 15ug and 30ug and there is a sitting tenant, they cannot be given notice to terminate the tenancy but the property must be decontaminated
5. Landlords must test if they have a suspicion of contamination, are notified by Council or the Police.
6. Landlords are not liable for not providing a tenant a clean or habitable property if they were not aware of the contamination at the time of the tenancy commencing. 
7. Results must be disclosed to the tenants within 7 days
8. The only allowable laboratory based testing is a Laboratory Composite
9. Testing between tenancies is not required as standard, but it will better support a claim in the Tenancy Tribunal.
10. Insurance insiders have suggested policies will change and cover may even be contingent on a baseline test but this is still being determined.
     

NZS 8510 Review Underway

Although these changes are significant, it’s important to note that NZS 8510 (Testing and Decontamination of Methamphetamine-Contaminated Properties) is still under review.

We are pleased to share that Healthy Homes NZ CEO, Nathaniel Hamilton, has been appointed to the working group responsible for updating this standard. His involvement ensures that practical, on-the-ground experience is represented in shaping the future of meth testing and decontamination in New Zealand.

We look forward to contributing to a revised standard that reflects both scientific evidence and real-world application.

Why Baseline Testing Still Matters

Despite the increased threshold, the need for baseline meth testing remains—if anything, it has become even more important.

A baseline establishes the condition of a property at the start of a tenancy, it protects landlords from liability and gives supporting evidence in Tenancy Tribunal cases.

Without baseline testing, disputes can quickly become difficult to prove and resolve, especially under the updated framework.

If you haven’t yet read The Tenancy Advisory blog, we’d recommend a read . The key outtakes of this are:

• Landlords should continue to test before and after tenancies
• Property managers should ensure clear documentation is maintained
• Evidence-based reporting will remain key in Tribunal decisions

Moving Forward with Confidence

These changes represent a maturing of the meth testing framework in New Zealand.

With clearer thresholds, standardised testing methods, and ongoing improvements to NZS 8510, the industry is moving toward a more transparent and practical future.

Healthy Homes NZ remains committed to staying at the forefront of these developments—providing trusted advice, compliant services, and peace of mind for landlords and property professionals across the country.

If you have questions about how these changes affect your property, our team is here to help.