Non-pesticidal uses of six substances on the Domestic Substances List

What are they?

  • The non-pesticidal uses of six substances on the Domestic Substances List (DSL) were assessed under the Canadian Environmental Protection Act, 1999 (CEPA 1999).
  • With the exception of methoxychlor, these substances are used in pest control products (pesticides) regulated by Health Canada under the Pest Control Products Act (PCPA). Use of methoxychlor in pesticides in Canada ended in December 2005.

How are they used?

  • These six substances are or were used in Canada only as pesticides.
  • At the time of the assessment, no uses or releases other than those regulated under the PCPA have been identified in Canada for these six substances.

Why did the Government of Canada assess them?

  • These six substances were identified as a potential concern for the environment based on their hazardous properties. Some of these substances can stay in the environment for a long time, and some can also harm animals or plants that live in water.
  • The Government of Canada collected information pertaining to potential non-pesticidal releases and sources of these substances to assess them.

How are Canadians exposed to them?

  • Exposure of Canadians to these six substances from non-pesticidal uses is not expected since no such uses were identified in this assessment.

How are they released into the environment?

  • Based on the data available, these six substances are not entering the environment from non-pesticidal uses.
  • Any releases to the environment from pesticidal uses have been assessed under the PCPA.

What are the results of the assessment?

  • The Government of Canada conducted a science-based evaluation of the non-pesticidal uses of these six substances called a screening assessment.
  • Since no uses or releases were identified in Canada for these substances, other than those regulated by the PCPA, the Government of Canada has concluded that these six substances are not entering the environment at levels that constitute a danger to the environment.
  • The Government of Canada also concluded that these six substances are not harmful to human health at current levels of exposure.
  • Hazards related to chemicals used in the workplace should be classified accordingly under the Workplace Hazardous Materials Information System (WHMIS).

What is the Government of Canada doing?

  • The Government of Canada published the Final Screening Assessment of the Six Substances on the Domestic Substances List on August 8, 2009.
  • Pesticides containing atrazine, chlorophacinone, trifluralin, and pentachlorophenol were re-evaluated under the PCPA, resulting in continued registration for specific uses. Chlorothalonil is currently undergoing re-evaluation and Health Canada has proposed for its continued registration of certain uses. A final re-evaluation decision is expected for chlorothalonil by March 2018.
  • All pesticidal uses of methoxychlor were discontinued and all registrations expired as of December 31, 2005; therefore, this substance is currently not registered under the PCPA.
  • Given the hazardous properties of these substances, there is concern that new non-pesticidal activities for the substances, which have not been identified or assessed under CEPA 1999, could lead to the substances becoming harmful to the environment. In 2009, the Government of Canada applied the Significant New Activity (SNAc) provisions of CEPA 1999 to these six substances. This requires that any proposed new non-pesticidal use of the six substances be subject to further assessment prior to the new activity being undertaken.
  • A Notice of intent to vary the SNAc requirements for six substances was published in the Canada Gazette, Part I on November 12, 2016. The proposed amendment will update the definition of SNAcs in relation to these substances, and update the data requirements.
  • The amendment is an outcome of the Review of current Significant New Activity Orders and Notices. The purpose of the variation is to ensure that SNAc Orders and Notices are consistent with current information, policies and approaches.
  • The current 2009 SNAc requirements on these six substances will remain in effect until the SNAc Order is published.

What can Canadians do?

  • The health risks associated with a chemical depend on the hazard (its potential to cause health effects) and the amount of chemical to which a person is exposed. Because exposure to these six substances is not expected, Canadians do not need to take specific actions to reduce their exposure.
  • As a general precaution, Canadians are reminded when using any product, to carefully follow safety warnings and directions and to dispose of the products appropriately.
  • Canadians who may be exposed to these substances in the workplace should consult with their employer and occupational health and safety (OHS) representative about safe handling practices, applicable laws and requirements under the OHS legislation and the Workplace Hazardous Materials Information System (WHMIS).
Six substances on the DSL assessed by the Government of Canada
72-43-5 Benzene, 1,1'-(2,2,2-trichloroethylidene)bis[4-methoxy- (methoxychlor)
87-86-5 Phenol, pentachloro- (pentachlorophenol)
1582-09-8 Benzenamine, 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)- (trifluralin)
1897-45-6 1,3-benzenedicarbonitrile, 2,4,5,6-tetrachloro- (chlorothalonil)
1912-24-9 1,3,5-triazine-2,4-diamine, 6-chloro-N-ethyl-N'-(1-methylethyl)- (atrazine)
3691-35-8 1H-indene-1,3(2H)-dione, 2-[(4-chlorophenyl)phenylacetyl]- (chlorophacinone)
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