Environment and Climate Change Canada (ECCC) proposed classifying methylstyrenated phenol (MSP, CAS RN 68512-30-1) as a "toxic substance" under Section 64 of the Canadian Environmental Protection Act (CEPA) on January 17, 2026, after releasing the most recent assessment results and a revised risk management document. The possible persistence, bioaccumulative nature, and long-term harmful consequences of MSP on aquatic ecosystems are the main reasons for the suggestion.
Background
MSP is a chemical that is frequently used in coatings for heavy machinery and ships. According to the 2008 evaluation, there is "no significant risk to the environment or human health." Its yearly import volume in Canada has, however, expanded dramatically to between 10 and 100 tonnes, according to latest monitoring data, and all of that is used in industrial production. The authorities have made the decision to start a reassessment to thoroughly examine its current environmental and health dangers due to shifting exposure levels and new ecotoxicological evidence.
Results of the Assessment
According to recent research, several of MSP's constituents are bioaccumulative, difficult for the environment to break down, and may be harmful to aquatic life even at low doses due to their potential to disrupt hormones. The outcomes of the risk evaluation for human health, however, are more positive. Although drinking water may expose the general public to the drug, the evaluation states that the present Margin of Exposure is thought to be adequate to handle uncertainties. The grouping with the highest exposure levels is infants because of their higher water intake in relation to body weight, but no other health hazards have been found. As a result, the evaluation comes to the conclusion that MSP does not now endanger Canadians' lives or health.
Public Input
Climate Change and the Environment A 60-day public consultation (until March 18) will be held by Canada and Health Canada to gather input on the assessment's findings and suggested risk management strategies. Stakeholders can use the ECCC's "Single Window" online system or send comments by email.
The Next Action
If the proposal is finalized, MSP will be formally added to Part 1 of Schedule 1 of the Canadian Environmental Protection Act. Then, in compliance with the law, the government will put limitations, prohibitions, or other control measures into place.
