Proposed Re-evaluation Decision PRVD2018-18, Copper (present as cuprous thiocyanate) and Its Associated End-use Products
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Pest Management Regulatory Agency
17 October 2018
ISSN: 1925-0967 (PDF version)
Catalogue number: H113-27/2018-18E-PDF (PDF version)
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Table of Contents
- Proposed Re-evaluation Decision
- Outcome of Science Evaluation
- Proposed Regulatory Decision for Copper thiocyanate
- International Context
- Next Steps
Proposed Re-evaluation Decision
Under the authority of the Pest Control Products Act, all registered pesticides must be regularly re-evaluated by Health Canada’s Pest Management Regulatory Agency (PMRA) to ensure that they continue to meet current health and environmental safety standards and continue to have value. The re-evaluation considers data and information from pesticide manufacturers, published scientific reports, and other regulatory agencies. Health Canada applies internationally accepted risk assessment methods as well as current risk management approaches and policies.
Copper (present as cuprous thiocyanate; also known as copper thiocyanate) is used in antifouling paint applied to boats. It can be used on aluminum, fibreglass, wood, steel and lead hulls below the true waterline in fresh, salt and brackish water and can be applied using brush, roller, and/or spray equipment. It is registered for both commercial and domestic uses.
This document (Proposed Re-evaluation Decision PRVD2018-18, Copper (present as cuprous thiocyanate) and Its Associated End-use Products) presents the proposed regulatory decision for the re-evaluation of copper thiocyanate including the proposed risk mitigation measures to further protect human health and the environment, as well as the science evaluation on which the proposed decision was based. All products containing copper thiocyanate registered in Canada are subject to this proposed re-evaluation decision. Proposed Re-evaluation Decision PRVD2018-18, Copper (present as cuprous thiocyanate) and Its Associated End-use Products is subject to a 90-day public consultation period, during which the public including the pesticide manufacturers and stakeholders may submit written comments and additional information to the PMRA Publications Section. The final re-evaluation decision will be published taking into consideration the comments and information received.
Outcome of Science Evaluation
Antifouling paints based on copper thiocyanate have acceptable value in that they are the only ones registered in Canada for use on aluminum boats, and they provide protection against fouling organisms in fresh, salt, and brackish waters at a lower copper concentration than what is found in other copper-based antifouling paints.
With respect to human health, risks are acceptable due to the low toxicity of copper thiocyanate and the low potential for exposure expected when the product is applied according to the label directions.
Aquatic environments are expected to be exposed to copper leachates from boats treated with copper thiocyanate based paint. When used as directed, potential risk to the aquatic environment from copper thiocyanate based antifouling paints is acceptable.
Proposed Regulatory Decision for Copper thiocyanate
Under the authority of the Pest Control Products Act and based on the evaluation of currently available scientific information, Health Canada is proposing that products containing copper thiocyanate are acceptable for continued registration in Canada, provided that required label updates are made to meet the current labelling standard.
Registered pesticide product labels include specific directions for use. Directions include risk mitigation measures to protect human health and the environment that must be followed by law. As a result of the re-evaluation of copper thiocyanate, further updates for product labels are being proposed (see Appendix II of the PRVD2018-18).
- Label updates to meet current standards for antifouling paint use, in other words, additional label statements for toxicology, additional personal protective equipment (PPE) and additional directions for use.
- Label updates to meet current standards for antifouling paint use, in other words, environmental hazards, storage, and disposal are proposed for both commercial and domestic end-use products.
Copper thiocyanate is currently acceptable for use as a pesticide in other Organisation for Economic Cooperation and Development (OECD) member countries, including Australia, the United States, and the European Union. No decision by an OECD-member country to prohibit all uses of copper thiocyanate for health or environmental reasons has been identified.
The public including the registrants and stakeholders are encouraged to submit comments during the 90-day public consultation periodFootnote 1 upon publication of this proposed re-evaluation decision.
All comments received during the 90-day public consultation period will be taken into consideration in preparation of re-evaluation decision document,Footnote 2 which could result in revised risk mitigation measures. The re-evaluation decision document will include the final re-evaluation decision, the reasons for it and a summary of comments received on the proposed re-evaluation decision with Health Canada’s responses.
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