Reassessment of paraquat

Your views are now being sought on a reassessment of the herbicide paraquat and associated formulations.

Paraquat is included in our priority chemicals list, which was unveiled in October 2018 as part of our revamped reassessments programme.

This is the first active ingredient from the priority chemicals list to be reassessed.

What we’re proposing

We’re proposing to further restrict the use of some paraquat-containing substances in order to manage the risks to people and the environment.

The tighter controls being proposed include restricting use to agriculture only, and imposing downwind buffer zones, and restrictions on application rates, frequencies, and intervals.

We propose revoking approvals for sale and use in New Zealand of two paraquat-containing substances which have mutagenic, carcinogenic or reproductive toxicant classifications and pose unnecessary risk, regardless of controls.

We also propose revoking the approvals for two substances that we can find no evidence of being used in this country.

The application documents

Read the application form, summary and submission guidelines and Appendix


Grounds to reassess paraquat were granted in July 2017, based on new information obtained in an application for a paraquat-containing formulation that was declined in 2016.

The published documents for these applications can be found here:

View the documents for the application for grounds for reassessment

View the documents for the declined application

This reassessment application contains further refined human health and environmental risk assessments, as well as an economic benefits assessment.

These risk and benefits assessments use data obtained in the call for information which was open between July and September 2017.

Making a submission

The deadline for submission has been extended to 30 April 2019. Please note the application documents have not been updated.

You can make a submissions on our assessment, proposals, and concerns contained in the application documents.

Please complete our online submission form and email it, with any attachments to

Online submission form

Submissions close at 5.00 pm, Tuesday 30 April 2019.